Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Recurring Fair Value Inputs (Details)

v3.10.0.1
Fair Value Measurements - Recurring Fair Value Inputs (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Other Assets, Fair Value Disclosure $ 23,738,000,000 $ 22,581,000,000        
Net derivative asset (liability) (570,000,000) (1,714,000,000) $ (1,588,000,000) $ (2,023,000,000) $ (1,803,000,000) $ (1,313,000,000)
Recurring            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 603,007,000,000 647,824,000,000        
Other Assets, Fair Value Disclosure 23,738,000,000 22,581,000,000        
Long-term debt (215,906,000,000) (208,238,000,000)        
Recurring | Level 3            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 13,079,000,000 12,909,000,000        
Other Assets, Fair Value Disclosure 3,140,000,000 2,425,000,000        
Long-term debt (5,890,000,000) (7,676,000,000)        
Net derivative asset (liability) $ (570,000,000) $ (1,714,000,000)        
Recurring | Level 3 | Discounted cash flow, Market comparables, Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Yield   7.50%        
Recurring | Level 3 | Minimum | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Price (in dollars per share) $ 10          
Recurring | Level 3 | Minimum | Discounted cash flow, Market comparables, Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Yield 7.00%          
Price (in dollars per share) $ 0 $ 0        
Equity correlation 9.00% 15.00%        
Long-dated equity volatilities 4.00% 4.00%        
Recurring | Level 3 | Maximum | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Price (in dollars per share) $ 100          
Recurring | Level 3 | Maximum | Discounted cash flow, Market comparables, Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Yield 46.00%          
Price (in dollars per share) $ 100 $ 100        
Equity correlation 100.00% 100.00%        
Long-dated equity volatilities 79.00% 84.00%        
Recurring | Level 3 | Weighted Average | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Price (in dollars per share) $ 96          
Recurring | Level 3 | Weighted Average | Discounted cash flow, Market comparables, Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Yield 18.00%          
Price (in dollars per share) $ 70 $ 66        
Equity correlation 61.00% 63.00%        
Long-dated equity volatilities 27.00% 22.00%        
Recurring | Level 3 | Loans and leases            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value $ 410,000,000 $ 571,000,000        
Recurring | Level 3 | Loans held-for-sale            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 526,000,000 690,000,000        
Recurring | Level 3 | Other assets            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 950,000,000          
Other Assets, Fair Value Disclosure 3,100,000,000          
Recurring | Level 3 | Credit derivatives            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Net derivative asset (liability) $ (304,000,000) $ (282,000,000)        
Recurring | Level 3 | Credit derivatives | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Loss severity 35.00% 35.00%        
Recurring | Level 3 | Credit derivatives | Minimum | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Yield 2.00% 1.00%        
Prepayment speed 15.00% 15.00%        
Default rate 1.00% 1.00%        
Price (in dollars per share) $ 0 $ 0        
Upfront points 0.00% 0.00%        
Credit correlation 70.00% 35.00%        
Recurring | Level 3 | Credit derivatives | Maximum | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Yield 12.00% 5.00%        
Prepayment speed 20.00% 20.00%        
Default rate 4.00% 4.00%        
Price (in dollars per share) $ 101 $ 102        
Upfront points 1.00% 1.00%        
Credit correlation   83.00%        
Recurring | Level 3 | Credit derivatives | Weighted Average | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Yield 4.00% 3.00%        
Prepayment speed 15.00% 16.00%        
Default rate 2.00% 2.00%        
Price (in dollars per share) $ 77 $ 82        
Upfront points 0.69% 0.71%        
Credit correlation   42.00%        
Recurring | Level 3 | Equity contracts            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Net derivative asset (liability) $ (857,000,000) $ (2,059,000,000)        
Recurring | Level 3 | Equity contracts | Minimum | Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Equity correlation 9.00% 15.00%        
Long-dated equity volatilities 4.00% 4.00%        
Recurring | Level 3 | Equity contracts | Maximum | Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Equity correlation 100.00% 100.00%        
Long-dated equity volatilities 79.00% 84.00%        
Recurring | Level 3 | Equity contracts | Weighted Average | Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Equity correlation 61.00% 63.00%        
Long-dated equity volatilities 27.00% 22.00%        
Recurring | Level 3 | Commodity contracts            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Net derivative asset (liability) $ 11,000,000 $ (3,000,000)        
Recurring | Level 3 | Commodity contracts | Minimum | Discounted cash flow, Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Long-dated equity volatilities 13.00% 26.00%        
Natural gas forward price $ 1 $ 1        
Correlation 53.00% 71.00%        
Recurring | Level 3 | Commodity contracts | Maximum | Discounted cash flow, Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Long-dated equity volatilities 495.00% 132.00%        
Natural gas forward price $ 11 $ 5        
Correlation 89.00% 87.00%        
Recurring | Level 3 | Commodity contracts | Weighted Average | Discounted cash flow, Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Long-dated equity volatilities 55.00% 57.00%        
Natural gas forward price $ 3 $ 3        
Correlation 78.00% 81.00%        
Recurring | Level 3 | Interest rate contracts            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Net derivative asset (liability) $ 580,000,000 $ 630,000,000        
Recurring | Level 3 | Interest rate contracts | Minimum | Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Correlation (IR/IR) 15.00% 15.00%        
Correlation (FX/IR) 0.00% 0.00%        
Long-dated inflation rates (20.00%) (14.00%)        
Long-dated inflation volatilities 0.00% 0.00%        
Recurring | Level 3 | Interest rate contracts | Maximum | Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Correlation (IR/IR) 80.00% 92.00%        
Correlation (FX/IR) 46.00% 46.00%        
Long-dated inflation rates 38.00% 38.00%        
Long-dated inflation volatilities 1.00% 1.00%        
Recurring | Level 3 | Interest rate contracts | Weighted Average | Industry standard derivative pricing            
Fair Value Inputs [Abstract]            
Correlation (IR/IR) 53.00% 50.00%        
Correlation (FX/IR) 1.00% 1.00%        
Long-dated inflation rates 2.00% 4.00%        
Long-dated inflation volatilities 1.00% 1.00%        
Recurring | Level 3 | Long-term debt            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Long-term debt $ (923,000,000) $ (1,863,000,000)        
Recurring | Level 3 | Mortgage trading loans, ABS and other MBS            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 1,500,000,000 1,500,000,000        
Recurring | Level 3 | Corporate securities, trading loans and other            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 1,500,000,000 1,900,000,000        
Recurring | Level 3 | Non-U.S. sovereign debt            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 469,000,000 556,000,000        
Recurring | Level 3 | Other taxable securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value   509,000,000        
Recurring | Level 3 | Tax-exempt securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value   469,000,000        
Recurring | Level 3 | Instruments backed by residential real estate assets            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value $ 1,615,000,000 $ 871,000,000        
Recurring | Level 3 | Instruments backed by residential real estate assets | Minimum | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Yield 0.00%          
Prepayment speed 0.00%          
Default rate 0.00%          
Loss severity 0.00%          
Price (in dollars per share) $ 0          
Recurring | Level 3 | Instruments backed by residential real estate assets | Minimum | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Yield   0.00%        
Prepayment speed   0.00%        
Default rate   0.00%        
Loss severity   0.00%        
Recurring | Level 3 | Instruments backed by residential real estate assets | Maximum | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Yield 25.00%          
Prepayment speed 19.00%          
Default rate 3.00%          
Loss severity 51.00%          
Price (in dollars per share) $ 141          
Recurring | Level 3 | Instruments backed by residential real estate assets | Maximum | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Yield   25.00%        
Prepayment speed   22.00%        
Default rate   3.00%        
Loss severity   53.00%        
Recurring | Level 3 | Instruments backed by residential real estate assets | Weighted Average | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Yield 7.00%          
Prepayment speed 11.00%          
Default rate 1.00%          
Loss severity 17.00%          
Price (in dollars per share) $ 75          
Recurring | Level 3 | Instruments backed by residential real estate assets | Weighted Average | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Yield   6.00%        
Prepayment speed   12.00%        
Default rate   1.00%        
Loss severity   17.00%        
Recurring | Level 3 | Instruments backed by residential real estate assets | Loans and leases            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value $ 410,000,000 $ 570,000,000        
Recurring | Level 3 | Instruments backed by residential real estate assets | Loans held-for-sale            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 1,000,000 3,000,000        
Recurring | Level 3 | Instruments backed by residential real estate assets | Available-for-sale Securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 555,000,000          
Recurring | Level 3 | Instruments backed by residential real estate assets | Other debt securities carried at fair value – Non-agency residential MBS            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 296,000,000          
Recurring | Level 3 | Instruments backed by residential real estate assets | Mortgage trading loans, ABS and other MBS | Trading Securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 353,000,000 298,000,000        
Recurring | Level 3 | Instruments backed by commercial real estate assets            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value $ 361,000,000 $ 286,000,000        
Recurring | Level 3 | Instruments backed by commercial real estate assets | Minimum | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Yield 0.00% 0.00%        
Price (in dollars per share) $ 0 $ 0        
Recurring | Level 3 | Instruments backed by commercial real estate assets | Maximum | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Yield 25.00% 25.00%        
Price (in dollars per share) $ 102 $ 100        
Recurring | Level 3 | Instruments backed by commercial real estate assets | Weighted Average | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Yield 7.00% 9.00%        
Price (in dollars per share) $ 78 $ 67        
Recurring | Level 3 | Instruments backed by commercial real estate assets | Mortgage trading loans, ABS and other MBS            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value $ 89,000,000 $ 42,000,000        
Recurring | Level 3 | Instruments backed by commercial real estate assets | Corporate securities, trading loans and other            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 272,000,000 244,000,000        
Recurring | Level 3 | Commercial loans, debt securities and other            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value $ 3,293,000,000 $ 4,023,000,000        
Recurring | Level 3 | Commercial loans, debt securities and other | Minimum | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Yield 1.00% 0.00%        
Prepayment speed 10.00% 10.00%        
Default rate 3.00% 3.00%        
Loss severity 35.00% 35.00%        
Price (in dollars per share) $ 0 $ 0        
Recurring | Level 3 | Commercial loans, debt securities and other | Maximum | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Yield 46.00% 12.00%        
Prepayment speed 20.00% 20.00%        
Default rate 4.00% 4.00%        
Loss severity 40.00% 40.00%        
Price (in dollars per share) $ 141 $ 145        
Recurring | Level 3 | Commercial loans, debt securities and other | Weighted Average | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Yield 14.00% 5.00%        
Prepayment speed 14.00% 16.00%        
Default rate 4.00% 4.00%        
Loss severity 38.00% 37.00%        
Price (in dollars per share) $ 65 $ 63        
Recurring | Level 3 | Commercial loans, debt securities and other | Loans and leases            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value   $ 1,000,000        
Recurring | Level 3 | Commercial loans, debt securities and other | Loans held-for-sale            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value $ 525,000,000 687,000,000        
Recurring | Level 3 | Commercial loans, debt securities and other | Mortgage trading loans, ABS and other MBS | Trading Securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 1,037,000,000 1,158,000,000        
Recurring | Level 3 | Commercial loans, debt securities and other | Corporate securities, trading loans and other | Trading Securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 1,262,000,000 1,613,000,000        
Recurring | Level 3 | Commercial loans, debt securities and other | Non-U.S. sovereign debt | Trading Securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value 469,000,000 556,000,000        
Recurring | Level 3 | Commercial loans, debt securities and other | Other taxable securities | Available-for-sale Securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value   8,000,000        
Recurring | Level 3 | Auction rate securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value   $ 977,000,000        
Recurring | Level 3 | Auction rate securities | Minimum | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Price (in dollars per share)   $ 10        
Recurring | Level 3 | Auction rate securities | Maximum | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Price (in dollars per share)   100        
Recurring | Level 3 | Auction rate securities | Weighted Average | Discounted cash flow, Market comparables            
Fair Value Inputs [Abstract]            
Price (in dollars per share)   $ 94        
Recurring | Level 3 | Auction rate securities | Corporate securities, trading loans and other | Trading Securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value   $ 7,000,000        
Recurring | Level 3 | Auction rate securities | Other taxable securities | Available-for-sale Securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value   501,000,000        
Recurring | Level 3 | Auction rate securities | Tax-exempt securities | Available-for-sale Securities            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value   469,000,000        
Recurring | Level 3 | MSRs            
Fair Value Inputs, Assets, Quantitative Information [Line Items]            
Assets, fair value $ 2,190,000,000 $ 2,302,000,000        
Recurring | Level 3 | MSRs | Minimum | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Weighted-average life, fixed rate 0 years 0 years        
Weighted-average life, variable rate 0 years 0 years        
Option Adjusted Spread, fixed rate 9.00% 9.00%        
Option Adjusted Spread, variable rate 9.00% 9.00%        
Recurring | Level 3 | MSRs | Maximum | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Weighted-average life, fixed rate 14 years 14 years        
Weighted-average life, variable rate 10 years 10 years        
Option Adjusted Spread, fixed rate 14.00% 14.00%        
Option Adjusted Spread, variable rate 15.00% 15.00%        
Recurring | Level 3 | MSRs | Weighted Average | Discounted cash flow, Stochastic recovery correlation model            
Fair Value Inputs [Abstract]            
Weighted-average life, fixed rate 6 years 5 years        
Weighted-average life, variable rate 3 years 3 years        
Option Adjusted Spread, fixed rate 10.00% 10.00%        
Option Adjusted Spread, variable rate 12.00% 12.00%