Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Recurring Fair Value Inputs (Details)

v3.10.0.1
Fair Value Measurements - Recurring Fair Value Inputs (Details)
Dec. 31, 2018
USD ($)
$ / security
$ / MMBTU
year
Dec. 31, 2017
USD ($)
$ / security
year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets $ 19,739,000,000 $ 22,581,000,000
Long-term debt (27,637,000,000) (31,786,000,000)
Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets 19,739,000,000 22,581,000,000
MSRs 2,000,000,000.0 2,300,000,000
Long-term debt (27,637,000,000) (31,786,000,000)
Recurring | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Instruments backed by residential real estate assets 1,536,000,000 871,000,000
Instruments backed by commercial real estate assets 291,000,000 286,000,000
Commercial loans, debt securities and other 3,489,000,000 4,023,000,000
Other assets 2,932,000,000 2,425,000,000
MSRs 2,042,000,000 2,302,000,000
Long-term debt (817,000,000) (1,863,000,000)
Auction rate securities   977,000,000
Net derivative asset (liability) $ (935,000,000) $ (1,714,000,000)
Recurring | Level 3 | Yield | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt   0.075
Recurring | Level 3 | Yield | Minimum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.00  
Commercial loans, debt securities and other 0.01 0.00
Recurring | Level 3 | Yield | Minimum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.00
Instruments backed by commercial real estate assets 0.00 0.00
Recurring | Level 3 | Yield | Minimum | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt 0.07  
Recurring | Level 3 | Yield | Maximum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.25  
Commercial loans, debt securities and other 0.18 0.12
Recurring | Level 3 | Yield | Maximum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.25
Instruments backed by commercial real estate assets 0.25 0.25
Recurring | Level 3 | Yield | Maximum | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt 0.18  
Recurring | Level 3 | Yield | Weighted Average | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.08  
Commercial loans, debt securities and other 0.13 0.05
Recurring | Level 3 | Yield | Weighted Average | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.06
Instruments backed by commercial real estate assets 0.07 0.09
Recurring | Level 3 | Yield | Weighted Average | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt 0.16  
Recurring | Level 3 | Prepayment speed | Minimum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.00  
Commercial loans, debt securities and other 0.10 0.10
Recurring | Level 3 | Prepayment speed | Minimum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.00
Recurring | Level 3 | Prepayment speed | Maximum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.21  
Commercial loans, debt securities and other 0.20 0.20
Recurring | Level 3 | Prepayment speed | Maximum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.22
Recurring | Level 3 | Prepayment speed | Weighted Average | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.12  
Commercial loans, debt securities and other 0.15 0.16
Recurring | Level 3 | Prepayment speed | Weighted Average | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.12
Recurring | Level 3 | Default rate | Minimum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.00  
Commercial loans, debt securities and other 0.03 0.03
Recurring | Level 3 | Default rate | Minimum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.00
Recurring | Level 3 | Default rate | Maximum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.03  
Commercial loans, debt securities and other 0.04 0.04
Recurring | Level 3 | Default rate | Maximum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.03
Recurring | Level 3 | Default rate | Weighted Average | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.01  
Commercial loans, debt securities and other 0.04 0.04
Recurring | Level 3 | Default rate | Weighted Average | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.01
Recurring | Level 3 | Loss severity | Minimum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.00  
Commercial loans, debt securities and other 0.35 0.35
Recurring | Level 3 | Loss severity | Minimum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.00
Recurring | Level 3 | Loss severity | Maximum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.51  
Commercial loans, debt securities and other 0.40 0.40
Recurring | Level 3 | Loss severity | Maximum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.53
Recurring | Level 3 | Loss severity | Weighted Average | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets 0.17  
Commercial loans, debt securities and other 0.38 0.37
Recurring | Level 3 | Loss severity | Weighted Average | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets   0.17
Recurring | Level 3 | Price | Minimum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets | $ / security 0  
Commercial loans, debt securities and other | $ / security 0 0
Other assets, primarily auction rate securities | $ / security 10  
Auction rate securities | $ / security   10
Recurring | Level 3 | Price | Minimum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by commercial real estate assets | $ / security 0 0
Recurring | Level 3 | Price | Minimum | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt | $ / security 0 0
Recurring | Level 3 | Price | Maximum | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets | $ / security 128  
Commercial loans, debt securities and other | $ / security 141 145
Other assets, primarily auction rate securities | $ / security 100  
Auction rate securities | $ / security   100
Recurring | Level 3 | Price | Maximum | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by commercial real estate assets | $ / security 100 100
Recurring | Level 3 | Price | Maximum | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt | $ / security 100 100
Recurring | Level 3 | Price | Weighted Average | Discounted cash flow, Market comparables    
Fair Value Inputs [Abstract]    
Instruments backed by residential real estate assets | $ / security 72  
Commercial loans, debt securities and other | $ / security 68 63
Other assets, primarily auction rate securities | $ / security 95  
Auction rate securities | $ / security   94
Recurring | Level 3 | Price | Weighted Average | Discounted cash flow    
Fair Value Inputs [Abstract]    
Instruments backed by commercial real estate assets | $ / security 79 67
Recurring | Level 3 | Price | Weighted Average | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt | $ / security 72 66
Recurring | Level 3 | Weighted-average life, fixed rate | Minimum | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs | year 0 0
Recurring | Level 3 | Weighted-average life, fixed rate | Maximum | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs | year 14 14
Recurring | Level 3 | Weighted-average life, fixed rate | Weighted Average | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs | year 5 5
Recurring | Level 3 | Weighted-average life, variable rate | Minimum | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs | year 0 0
Recurring | Level 3 | Weighted-average life, variable rate | Maximum | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs | year 10 10
Recurring | Level 3 | Weighted-average life, variable rate | Weighted Average | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs | year 3 3
Recurring | Level 3 | Option-adjusted spread, fixed rate | Minimum | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs 0.07 0.09
Recurring | Level 3 | Option-adjusted spread, fixed rate | Maximum | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs 0.14 0.14
Recurring | Level 3 | Option-adjusted spread, fixed rate | Weighted Average | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs 0.09 0.10
Recurring | Level 3 | Option-adjusted spread, variable rate | Minimum | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs 0.09 0.09
Recurring | Level 3 | Option-adjusted spread, variable rate | Maximum | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs 0.15 0.15
Recurring | Level 3 | Option-adjusted spread, variable rate | Weighted Average | Discounted cash flow    
Fair Value Inputs [Abstract]    
MSRs 0.12 0.12
Recurring | Level 3 | Equity correlation | Minimum | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt 0.11 0.15
Recurring | Level 3 | Equity correlation | Maximum | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt 1.00 1.00
Recurring | Level 3 | Equity correlation | Weighted Average | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt 0.67 0.63
Recurring | Level 3 | Long-dated equity volatilities | Minimum | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt 0.04 0.04
Recurring | Level 3 | Long-dated equity volatilities | Maximum | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt 0.84 0.84
Recurring | Level 3 | Long-dated equity volatilities | Weighted Average | Discounted cash flow, Market comparables, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Long-term debt 0.32 0.22
Recurring | Level 3 | Credit derivatives    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Net derivative asset (liability) $ (565,000,000) $ (282,000,000)
Recurring | Level 3 | Credit derivatives | Yield | Minimum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.00 0.01
Recurring | Level 3 | Credit derivatives | Yield | Maximum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.05 0.05
Recurring | Level 3 | Credit derivatives | Yield | Weighted Average | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.04 0.03
Recurring | Level 3 | Credit derivatives | Prepayment speed | Minimum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.15 0.15
Recurring | Level 3 | Credit derivatives | Prepayment speed | Maximum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.20 0.20
Recurring | Level 3 | Credit derivatives | Prepayment speed | Weighted Average | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.15 0.16
Recurring | Level 3 | Credit derivatives | Default rate | Minimum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.01 0.01
Recurring | Level 3 | Credit derivatives | Default rate | Maximum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.04 0.04
Recurring | Level 3 | Credit derivatives | Default rate | Weighted Average | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.02 0.02
Recurring | Level 3 | Credit derivatives | Loss severity | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.35 0.35
Recurring | Level 3 | Credit derivatives | Price | Minimum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets | $ / security 0 0
Recurring | Level 3 | Credit derivatives | Price | Maximum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets | $ / security 138 102
Recurring | Level 3 | Credit derivatives | Price | Weighted Average | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets | $ / security 93 82
Recurring | Level 3 | Credit derivatives | Upfront points | Minimum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0 0
Recurring | Level 3 | Credit derivatives | Upfront points | Maximum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.0100 0.01
Recurring | Level 3 | Credit derivatives | Upfront points | Weighted Average | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.0070 0.0071
Recurring | Level 3 | Credit derivatives | Credit correlation | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets 0.70  
Recurring | Level 3 | Credit derivatives | Credit correlation | Minimum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets   0.35
Recurring | Level 3 | Credit derivatives | Credit correlation | Maximum | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets   0.83
Recurring | Level 3 | Credit derivatives | Credit correlation | Weighted Average | Discounted cash flow, Stochastic recovery correlation model    
Fair Value Inputs [Abstract]    
Net derivative assets   0.42
Recurring | Level 3 | Equity contracts    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Net derivative asset (liability) $ (348,000,000) $ (2,059,000,000)
Recurring | Level 3 | Equity contracts | Equity correlation | Minimum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.11 0.15
Recurring | Level 3 | Equity contracts | Equity correlation | Maximum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 1.00 1.00
Recurring | Level 3 | Equity contracts | Equity correlation | Weighted Average | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.67 0.63
Recurring | Level 3 | Equity contracts | Long-dated equity volatilities | Minimum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.04 0.04
Recurring | Level 3 | Equity contracts | Long-dated equity volatilities | Maximum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.84 0.84
Recurring | Level 3 | Equity contracts | Long-dated equity volatilities | Weighted Average | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.32 0.22
Recurring | Level 3 | Commodity contracts    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Net derivative asset (liability) $ 10,000,000 $ (3,000,000)
Recurring | Level 3 | Commodity contracts | Natural gas forward price | Minimum | Discounted cash flow, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 1 1
Recurring | Level 3 | Commodity contracts | Natural gas forward price | Maximum | Discounted cash flow, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 12 5
Recurring | Level 3 | Commodity contracts | Natural gas forward price | Weighted Average | Discounted cash flow, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 3 3
Recurring | Level 3 | Commodity contracts | Correlation | Minimum | Discounted cash flow, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.38 0.71
Recurring | Level 3 | Commodity contracts | Correlation | Maximum | Discounted cash flow, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.87 0.87
Recurring | Level 3 | Commodity contracts | Correlation | Weighted Average | Discounted cash flow, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.71 0.81
Recurring | Level 3 | Commodity contracts | Volatilities | Minimum | Discounted cash flow, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.15 0.26
Recurring | Level 3 | Commodity contracts | Volatilities | Maximum | Discounted cash flow, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 1.32 1.32
Recurring | Level 3 | Commodity contracts | Volatilities | Weighted Average | Discounted cash flow, Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.38 0.57
Recurring | Level 3 | Interest rate contracts    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Net derivative asset (liability) $ (32,000,000) $ 630,000,000
Recurring | Level 3 | Interest rate contracts | Correlation (IR/IR) | Minimum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.15 0.15
Recurring | Level 3 | Interest rate contracts | Correlation (IR/IR) | Maximum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.70 0.92
Recurring | Level 3 | Interest rate contracts | Correlation (IR/IR) | Weighted Average | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.61 0.50
Recurring | Level 3 | Interest rate contracts | Correlation (FX/IR) | Minimum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.00 0.00
Recurring | Level 3 | Interest rate contracts | Correlation (FX/IR) | Maximum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.46 0.46
Recurring | Level 3 | Interest rate contracts | Correlation (FX/IR) | Weighted Average | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.01 0.01
Recurring | Level 3 | Interest rate contracts | Long-dated inflation rates | Minimum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets (0.20) (0.14)
Recurring | Level 3 | Interest rate contracts | Long-dated inflation rates | Maximum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.38 0.38
Recurring | Level 3 | Interest rate contracts | Long-dated inflation rates | Weighted Average | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.02 0.04
Recurring | Level 3 | Interest rate contracts | Long-dated inflation volatilities | Minimum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.00 0.00
Recurring | Level 3 | Interest rate contracts | Long-dated inflation volatilities | Maximum | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.01 0.01
Recurring | Level 3 | Interest rate contracts | Long-dated inflation volatilities | Weighted Average | Industry standard derivative pricing    
Fair Value Inputs [Abstract]    
Net derivative assets 0.01 0.01
Recurring | Level 3 | Mortgage trading loans, ABS and other MBS    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Instruments backed by residential real estate assets $ 419,000,000 $ 298,000,000
Instruments backed by commercial real estate assets 91,000,000 42,000,000
Commercial loans, debt securities and other 1,125,000,000 1,158,000,000
Fair Value Inputs [Abstract]    
Loans and securities, fair value 1,600,000,000 1,500,000,000
Recurring | Level 3 | Loans and leases    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Instruments backed by residential real estate assets 338,000,000 570,000,000
Commercial loans, debt securities and other   1,000,000
Fair Value Inputs [Abstract]    
Loans and securities, fair value 338,000,000 571,000,000
Recurring | Level 3 | Loans held-for-sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Instruments backed by residential real estate assets 1,000,000 3,000,000
Commercial loans, debt securities and other 541,000,000 687,000,000
Fair Value Inputs [Abstract]    
Loans and securities, fair value 542,000,000 690,000,000
Recurring | Level 3 | Other assets, primarily auction rate securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets 890,000,000  
Recurring | Level 3 | Available-for-sale debt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Instruments backed by residential real estate assets 606,000,000  
Fair Value Inputs [Abstract]    
Loans and securities, fair value 606,000,000  
Recurring | Level 3 | Other debt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Instruments backed by residential real estate assets 172,000,000  
Fair Value Inputs [Abstract]    
Loans and securities, fair value 172,000,000  
Recurring | Level 3 | Corporate securities, trading loans and other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Instruments backed by commercial real estate assets 200,000,000 244,000,000
Commercial loans, debt securities and other 1,358,000,000 1,613,000,000
Auction rate securities   7,000,000
Fair Value Inputs [Abstract]    
Loans and securities, fair value 1,600,000,000 1,900,000,000
Recurring | Level 3 | Non-U.S. sovereign debt    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Commercial loans, debt securities and other 465,000,000 556,000,000
Fair Value Inputs [Abstract]    
Loans and securities, fair value 465,000,000 556,000,000
Recurring | Level 3 | Other taxable securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Commercial loans, debt securities and other   8,000,000
Auction rate securities   501,000,000
Fair Value Inputs [Abstract]    
Loans and securities, fair value   509,000,000
Recurring | Level 3 | Tax-exempt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Auction rate securities   469,000,000
Fair Value Inputs [Abstract]    
Loans and securities, fair value   $ 469,000,000
Recurring | Level 3 | Other Assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets $ 2,900,000,000