Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Recurring Fair Value Inputs (Details)

v3.8.0.1
Fair Value Measurements - Recurring Fair Value Inputs (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ (1,138,000,000) $ (1,714,000,000) $ (1,665,000,000) $ (1,313,000,000)
Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 647,855,000,000 645,590,000,000    
Long-term debt (222,191,000,000) (208,238,000,000)    
Recurring | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 12,818,000,000 12,909,000,000    
Long-term debt (7,068,000,000) (7,676,000,000)    
Net derivative asset (liability) $ (1,138,000,000) $ (1,714,000,000)    
Recurring | Level 3 | Discounted cash flow, Market comparables, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Yield 7.50% 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]        
Price (in dollars per share) $ 0 $ 0    
Equity correlation 7.00% 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]        
Price (in dollars per share) $ 100 $ 100    
Equity correlation 100.00% 100.00%    
Long-dated equity volatilities 70.00% 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]        
Price (in dollars per share) $ 73 $ 66    
Equity correlation 68.00% 63.00%    
Long-dated equity volatilities 23.00% 22.00%    
Recurring | Level 3 | Other assets        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 999,000,000      
Recurring | Level 3 | Loans and leases        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 526,000,000 $ 571,000,000    
Recurring | Level 3 | Loans Held-for-Sale        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 685,000,000 690,000,000    
Recurring | Level 3 | Credit derivatives        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ (298,000,000) $ (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 22.00% 35.00%    
Recurring | Level 3 | Credit derivatives | Minimum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Prepayment speed   10.00%    
Recurring | Level 3 | Credit derivatives | Maximum | Discounted cash flow, Stochastic recovery correlation model        
Fair Value Inputs [Abstract]        
Yield 4.00% 5.00%    
Prepayment speed 20.00% 20.00%    
Default rate 4.00% 4.00%    
Price (in dollars per share) $ 83 $ 102    
Upfront points 1.00% 1.00%    
Credit correlation 80.00% 83.00%    
Recurring | Level 3 | Credit derivatives | Maximum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Prepayment speed   20.00%    
Recurring | Level 3 | Credit derivatives | Weighted Average | Discounted cash flow, Stochastic recovery correlation model        
Fair Value Inputs [Abstract]        
Yield 3.00% 3.00%    
Prepayment speed 15.00% 16.00%    
Default rate 2.00% 2.00%    
Price (in dollars per share) $ 73 $ 82    
Upfront points 0.71% 0.71%    
Credit correlation 38.00% 42.00%    
Recurring | Level 3 | Equity contracts        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ (1,508,000,000) $ (2,059,000,000)    
Recurring | Level 3 | Equity contracts | Minimum | Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Equity correlation 7.00% 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 70.00% 84.00%    
Recurring | Level 3 | Equity contracts | Weighted Average | Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Equity correlation 68.00% 63.00%    
Long-dated equity volatilities 23.00% 22.00%    
Recurring | Level 3 | Commodity contracts        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ 2,000,000 $ (3,000,000)    
Recurring | Level 3 | Commodity contracts | Minimum | Discounted cash flow, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Long-dated equity volatilities 11.00% 26.00%    
Natural gas forward price $ 1 $ 1    
Correlation 65.00% 71.00%    
Recurring | Level 3 | Commodity contracts | Maximum | Discounted cash flow, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Long-dated equity volatilities 196.00% 132.00%    
Natural gas forward price $ 5 $ 5    
Correlation 93.00% 87.00%    
Recurring | Level 3 | Commodity contracts | Weighted Average | Discounted cash flow, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Long-dated equity volatilities 60.00% 57.00%    
Natural gas forward price $ 3 $ 3    
Correlation 79.00% 81.00%    
Recurring | Level 3 | Interest rate contracts        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ 666,000,000 $ 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 (18.00%) (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) 70.00% 92.00%    
Correlation (FX/IR) 46.00% 46.00%    
Long-dated inflation rates 34.00% 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) 43.00% 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 $ (1,351,000,000) $ (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 1,400,000,000 1,500,000,000    
Recurring | Level 3 | Corporate securities, trading loans and other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 1,700,000,000 1,900,000,000    
Recurring | Level 3 | Non-U.S. sovereign debt        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 401,000,000 556,000,000    
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 $ 845,000,000 $ 871,000,000    
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% 0.00%    
Prepayment speed 0.00% 0.00%    
Default rate 0.00% 0.00%    
Loss severity 0.00% 0.00%    
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% 25.00%    
Prepayment speed 20.00% 22.00%    
Default rate 2.00% 3.00%    
Loss severity 52.00% 53.00%    
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 11.00%      
Default rate 1.00%      
Loss severity 17.00%      
Recurring | Level 3 | Instruments backed by residential real estate assets | Weighted Average | Discounted cash flow, Market comparables        
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 $ 525,000,000 $ 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 2,000,000 3,000,000    
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 318,000,000 298,000,000    
Recurring | Level 3 | Instruments backed by commercial real estate assets        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 299,000,000 $ 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) $ 100 $ 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 9.00%      
Price (in dollars per share) $ 67      
Recurring | Level 3 | Instruments backed by commercial real estate assets | Weighted Average | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Yield   9.00%    
Price (in dollars per share)   $ 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 $ 34,000,000 $ 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 265,000,000 244,000,000    
Recurring | Level 3 | Commercial loans, debt securities and other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 3,592,000,000 $ 4,023,000,000    
Recurring | Level 3 | Commercial loans, debt securities and other | Minimum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Yield 0.00% 0.00%    
Prepayment speed 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 12.00% 12.00%    
Prepayment speed 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 5.00% 5.00%    
Prepayment speed 15.00% 16.00%    
Default rate 4.00% 4.00%    
Loss severity 38.00% 37.00%    
Price (in dollars per share) $ 66 $ 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 $ 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 683,000,000 687,000,000    
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 1,020,000,000 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 1,444,000,000 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 401,000,000 556,000,000    
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 43,000,000 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 $ 2,296,000,000 $ 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%