Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Recurring Fair Value Inputs (Details)

v3.8.0.1
Fair Value Measurements - Recurring Fair Value Inputs (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ (1,714,000,000) $ (1,313,000,000) $ (441,000,000) $ (920,000,000)
Recurring        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 645,590,000,000 614,410,000,000    
Long-term debt (208,238,000,000) (185,699,000,000)    
Recurring | Level 3        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 12,909,000,000 14,462,000,000    
Long-term debt (7,676,000,000) (7,153,000,000)    
Net derivative asset (liability) $ (1,714,000,000) $ (1,313,000,000)    
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, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Yield   6.00%    
Price (in dollars per share) $ 0 $ 12    
Duration   0 years    
Equity correlation 15.00% 13.00%    
Long-dated equity volatilities 4.00% 4.00%    
Recurring | Level 3 | Maximum | Discounted cash flow, Market comparables, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Yield   37.00%    
Price (in dollars per share) $ 100 $ 87    
Duration   5 years    
Equity correlation 100.00% 100.00%    
Long-dated equity volatilities 84.00% 76.00%    
Recurring | Level 3 | Weighted Average | Discounted cash flow, Market comparables, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Yield   20.00%    
Price (in dollars per share) $ 66 $ 73    
Duration   3 years    
Equity correlation 63.00% 68.00%    
Long-dated equity volatilities 22.00% 26.00%    
Recurring | Level 3 | Loans and leases        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 571,000,000 $ 720,000,000    
Recurring | Level 3 | Loans Held-for-Sale        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 690,000,000 656,000,000    
Recurring | Level 3 | Credit derivatives        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ (282,000,000) $ (129,000,000)    
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 1.00% 0.00%    
Prepayment speed 15.00% 10.00%    
Default rate 1.00% 1.00%    
Price (in dollars per share) $ 0      
Upfront points 0.00% 0.00%    
Credit spreads   0.17%    
Credit correlation 35.00% 21.00%    
Recurring | Level 3 | Credit derivatives | Maximum | Discounted cash flow, Stochastic recovery correlation model        
Fair Value Inputs [Abstract]        
Yield 5.00% 24.00%    
Prepayment speed 20.00% 20.00%    
Default rate 4.00% 4.00%    
Price (in dollars per share) $ 102      
Upfront points 1.00% 1.00%    
Credit spreads   8.14%    
Credit correlation 83.00% 80.00%    
Recurring | Level 3 | Credit derivatives | Weighted Average | Discounted cash flow, Stochastic recovery correlation model        
Fair Value Inputs [Abstract]        
Yield 3.00% 13.00%    
Prepayment speed 16.00% 18.00%    
Default rate 2.00% 3.00%    
Price (in dollars per share) $ 82      
Upfront points 0.71% 0.72%    
Credit spreads   2.48%    
Credit correlation 42.00% 44.00%    
Recurring | Level 3 | Equity contracts        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ (2,059,000,000) $ (1,690,000,000)    
Recurring | Level 3 | Equity contracts | Minimum | Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Equity correlation 15.00% 13.00%    
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 84.00% 76.00%    
Recurring | Level 3 | Equity contracts | Weighted Average | Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Equity correlation 63.00% 68.00%    
Long-dated equity volatilities 22.00% 26.00%    
Recurring | Level 3 | Commodity contracts        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ (3,000,000) $ 6,000,000    
Recurring | Level 3 | Commodity contracts | Minimum | Discounted cash flow, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Long-dated equity volatilities 26.00% 23.00%    
Natural gas forward price $ 1 $ 2    
Correlation 71.00% 66.00%    
Recurring | Level 3 | Commodity contracts | Maximum | Discounted cash flow, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Long-dated equity volatilities 132.00% 96.00%    
Natural gas forward price $ 5 $ 6    
Correlation 87.00% 95.00%    
Recurring | Level 3 | Commodity contracts | Weighted Average | Discounted cash flow, Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Long-dated equity volatilities 57.00% 36.00%    
Natural gas forward price $ 3 $ 4    
Correlation 81.00% 85.00%    
Recurring | Level 3 | Interest rate contracts        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Net derivative asset (liability) $ 630,000,000 $ 500,000,000    
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%    
Illiquid IR and long-dated inflation rates (14.00%) (12.00%)    
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) 92.00% 99.00%    
Correlation (FX/IR) 46.00% 40.00%    
Illiquid IR and long-dated inflation rates 38.00% 35.00%    
Long-dated inflation volatilities 1.00% 2.00%    
Recurring | Level 3 | Interest rate contracts | Weighted Average | Industry standard derivative pricing        
Fair Value Inputs [Abstract]        
Correlation (IR/IR) 50.00% 56.00%    
Correlation (FX/IR) 1.00% 2.00%    
Illiquid IR and long-dated inflation rates 4.00% 5.00%    
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 $ (1,863,000,000) $ (1,514,000,000)    
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 1,200,000,000    
Recurring | Level 3 | Corporate securities, trading loans and other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 1,900,000,000 2,800,000,000    
Recurring | Level 3 | Non-U.S. sovereign debt        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 556,000,000 510,000,000    
Recurring | Level 3 | Other taxable securities        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 509,000,000 594,000,000    
Recurring | Level 3 | Tax-exempt securities        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 469,000,000 542,000,000    
Recurring | Level 3 | Instruments backed by residential real estate assets        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 871,000,000 $ 1,066,000,000    
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%      
Prepayment speed 0.00%      
Default rate 0.00%      
Loss severity 0.00%      
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%    
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 | Maximum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Yield   50.00%    
Prepayment speed   27.00%    
Default rate   3.00%    
Loss severity   54.00%    
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 12.00%      
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   7.00%    
Prepayment speed   14.00%    
Default rate   2.00%    
Loss severity   18.00%    
Recurring | Level 3 | Instruments backed by residential real estate assets | Loans and leases        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 570,000,000 $ 718,000,000    
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 3,000,000 11,000,000    
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 298,000,000 337,000,000    
Recurring | Level 3 | Instruments backed by commercial real estate assets        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 286,000,000 $ 317,000,000    
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%      
Price (in dollars per share) $ 0      
Recurring | Level 3 | Instruments backed by commercial real estate assets | Minimum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Yield   0.00%    
Price (in dollars per share)   $ 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%      
Price (in dollars per share) $ 100      
Recurring | Level 3 | Instruments backed by commercial real estate assets | Maximum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Yield   39.00%    
Price (in dollars per share)   $ 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   11.00%    
Price (in dollars per share)   $ 65    
Recurring | Level 3 | Instruments backed by commercial real estate assets | Loans Held-for-Sale        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value   $ 86,000,000    
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 $ 42,000,000 53,000,000    
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 244,000,000 178,000,000    
Recurring | Level 3 | Commercial loans, debt securities and other        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 4,023,000,000 $ 4,486,000,000    
Recurring | Level 3 | Commercial loans, debt securities and other | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Enterprise value/EBITDA multiple   34    
Recurring | Level 3 | Commercial loans, debt securities and other | Minimum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Yield 0.00% 1.00%    
Prepayment speed 10.00% 5.00%    
Default rate 3.00% 3.00%    
Loss severity 35.00% 0.00%    
Price (in dollars per share) $ 0 $ 0    
Duration   0 years    
Recurring | Level 3 | Commercial loans, debt securities and other | Maximum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Yield 12.00% 37.00%    
Prepayment speed 20.00% 20.00%    
Default rate 4.00% 4.00%    
Loss severity 40.00% 50.00%    
Price (in dollars per share) $ 145 $ 292    
Duration   5 years    
Recurring | Level 3 | Commercial loans, debt securities and other | Weighted Average | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Yield 5.00% 14.00%    
Prepayment speed 16.00% 19.00%    
Default rate 4.00% 4.00%    
Loss severity 37.00% 19.00%    
Price (in dollars per share) $ 63 $ 68    
Duration   3 years    
Recurring | Level 3 | Commercial loans, debt securities and other | Available-for-sale Securities        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 8,000,000      
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 $ 2,000,000    
Recurring | Level 3 | Commercial loans, debt securities and other | Loans Held-for-Sale        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 687,000,000 559,000,000    
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 1,158,000,000 821,000,000    
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 1,613,000,000 2,565,000,000    
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 556,000,000 510,000,000    
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   29,000,000    
Recurring | Level 3 | Auction rate securities        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 977,000,000 $ 1,141,000,000    
Recurring | Level 3 | Auction rate securities | Minimum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Price (in dollars per share) $ 10 $ 10    
Recurring | Level 3 | Auction rate securities | Maximum | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Price (in dollars per share) 100 100    
Recurring | Level 3 | Auction rate securities | Weighted Average | Discounted cash flow, Market comparables        
Fair Value Inputs [Abstract]        
Price (in dollars per share) $ 94 $ 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 $ 34,000,000    
Recurring | Level 3 | Auction rate securities | Other taxable securities | Available-for-sale Securities        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 501,000,000 565,000,000    
Recurring | Level 3 | Auction rate securities | Tax-exempt securities | Available-for-sale Securities        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value 469,000,000 542,000,000    
Recurring | Level 3 | MSRs        
Fair Value Inputs, Assets, Quantitative Information [Line Items]        
Assets, fair value $ 2,302,000,000 $ 2,747,000,000    
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 15 years    
Weighted-average life, variable rate 10 years 14 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 5 years 6 years    
Weighted-average life, variable rate 3 years 4 years    
Option Adjusted Spread, fixed rate 10.00% 10.00%    
Option Adjusted Spread, variable rate 12.00% 12.00%