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Fair Value - Schedule of Fair Value Measurements on a Recurring Basis (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets $ 849,000,000 $ 924,000,000
Investment securities available for sale 70,070,000,000 94,913,000,000
Reduction in assets from netting and the result of cash collateral deposited with derivative counterparties 776,000,000 983,000,000
Reduction in liabilities from netting and the result of cash collateral received from derivative counterparties 1,120,000,000 2,630,000,000
Collateralized loan obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,760,000,000 3,800,000,000
Automobile loan securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 315,000,000
Non-US debt securities, covered bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 3,180,000,000 3,300,000,000
Non-U.S. debt securities, other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 613,000,000 1,200,000,000
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 849,000,000 924,000,000
Investment securities available for sale 70,070,000,000 94,913,000,000
Derivative asset, gross liability and obligation to return cash, offset (6,679,000,000) (7,280,000,000)
Derivative assets 4,777,000,000 7,934,000,000
Other assets 2,000,000  
Assets, fair value disclosure 75,698,000,000 103,771,000,000
Derivative liability, gross asset and obligation to return cash, offset (7,021,000,000) (8,926,000,000)
Derivative liabilities 4,132,000,000 6,308,000,000
Other liabilities 2,000,000  
Total 4,233,000,000 6,308,000,000
Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 5,000,000  
Recurring | Other U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 18,000,000  
Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 76,000,000  
Recurring | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, gross liability and obligation to return cash, offset (6,562,000,000) (7,211,000,000)
Derivative assets 4,754,000,000 7,924,000,000
Derivative liability, gross asset and obligation to return cash, offset (6,995,000,000) (8,879,000,000)
Derivative liabilities 3,873,000,000 6,046,000,000
Recurring | Interest-rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, gross liability and obligation to return cash, offset (115,000,000) (68,000,000)
Derivative assets 20,000,000 9,000,000
Derivative liability, gross asset and obligation to return cash, offset (24,000,000) (46,000,000)
Derivative liabilities 158,000,000 193,000,000
Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset, gross liability and obligation to return cash, offset (2,000,000) (1,000,000)
Derivative assets 3,000,000 1,000,000
Derivative liability, gross asset and obligation to return cash, offset (2,000,000) (1,000,000)
Derivative liabilities 101,000,000 69,000,000
Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 32,000,000 20,000,000
Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 479,000,000 378,000,000
Recurring | Other U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 338,000,000 526,000,000
Investment securities available for sale 2,624,000,000 4,109,000,000
Recurring | US Treasury and federal agencies, direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 5,718,000,000 10,655,000,000
Recurring | US Treasury and federal agencies, mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 18,165,000,000 20,714,000,000
Recurring | Asset-backed securities, student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 7,176,000,000 12,460,000,000
Recurring | Asset-backed securities, credit cards    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,341,000,000 3,053,000,000
Recurring | Asset-backed securities, sub-prime    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 419,000,000 951,000,000
Recurring | Asset-backed securities, other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,764,000,000 4,145,000,000
Recurring | Total asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 10,700,000,000 20,609,000,000
Recurring | Non-U.S. debt securities, mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 7,071,000,000 9,606,000,000
Recurring | Non-U.S. debt securities, asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 3,267,000,000 3,226,000,000
Recurring | Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 4,355,000,000 3,909,000,000
Recurring | Non-U.S. debt securities, other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 4,834,000,000 5,428,000,000
Recurring | Total non-U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 19,527,000,000 22,169,000,000
Recurring | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 9,746,000,000 10,820,000,000
Recurring | Collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 2,987,000,000 5,339,000,000
Recurring | U.S. equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 39,000,000 39,000,000
Recurring | Non-U.S. equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 3,000,000 2,000,000
Recurring | U.S. money-market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 542,000,000 449,000,000
Recurring | Non-U.S. money-market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 19,000,000 8,000,000
Quoted Market Prices in Active Markets (Level 1) | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 521,000,000 418,000,000
Investment securities available for sale 5,206,000,000 10,056,000,000
Derivative asset 0 0
Other assets 2,000,000  
Assets, fair value disclosure 5,729,000,000 10,474,000,000
Derivative liability 0 0
Other liabilities 2,000,000  
Total 88,000,000 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 5,000,000  
Quoted Market Prices in Active Markets (Level 1) | Recurring | Other U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 5,000,000  
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 76,000,000  
Quoted Market Prices in Active Markets (Level 1) | Recurring | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Interest-rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 32,000,000 20,000,000
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 479,000,000 378,000,000
Quoted Market Prices in Active Markets (Level 1) | Recurring | Other U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 10,000,000 20,000,000
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | US Treasury and federal agencies, direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 5,206,000,000 10,056,000,000
Quoted Market Prices in Active Markets (Level 1) | Recurring | US Treasury and federal agencies, mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Asset-backed securities, student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Asset-backed securities, credit cards    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Asset-backed securities, sub-prime    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Asset-backed securities, other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Total asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. debt securities, mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. debt securities, asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. debt securities, other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Total non-U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | U.S. equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | U.S. money-market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Quoted Market Prices in Active Markets (Level 1) | Recurring | Non-U.S. money-market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 328,000,000 506,000,000
Investment securities available for sale 62,400,000,000 79,491,000,000
Derivative asset 11,451,000,000 15,133,000,000
Other assets 0  
Assets, fair value disclosure 74,179,000,000 95,130,000,000
Derivative liability 11,148,000,000 15,151,000,000
Other liabilities 0  
Total 11,161,000,000 15,151,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 0  
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Other U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 13,000,000  
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 0  
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 11,311,000,000 15,054,000,000
Derivative liability 10,863,000,000 14,851,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Interest-rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 135,000,000 77,000,000
Derivative liability 182,000,000 239,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 5,000,000 2,000,000
Derivative liability 103,000,000 61,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Other U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 328,000,000 506,000,000
Investment securities available for sale 2,614,000,000 4,100,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | US Treasury and federal agencies, direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 512,000,000 599,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | US Treasury and federal agencies, mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 18,165,000,000 20,714,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Asset-backed securities, student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 6,987,000,000 12,201,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Asset-backed securities, credit cards    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,341,000,000 3,053,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Asset-backed securities, sub-prime    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 419,000,000 951,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Asset-backed securities, other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 365,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Total asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 8,747,000,000 16,570,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Non-U.S. debt securities, mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 7,071,000,000 9,606,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Non-U.S. debt securities, asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 3,093,000,000 2,931,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 4,355,000,000 3,909,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Non-U.S. debt securities, other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 4,579,000,000 5,057,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Total non-U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 19,098,000,000 21,503,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 9,713,000,000 10,782,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 2,948,000,000 4,725,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | U.S. equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 39,000,000 39,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Non-U.S. equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 3,000,000 2,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | U.S. money-market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 542,000,000 449,000,000
Pricing Methods with Significant Observable Market Inputs (Level 2) | Recurring | Non-U.S. money-market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 19,000,000 8,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure 2,469,000,000 5,447,000,000
Total 5,000,000 83,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Investment securities available for sale 2,464,000,000 5,366,000,000
Derivative asset 5,000,000 81,000,000
Other assets 0  
Assets, fair value disclosure 2,469,000,000 5,447,000,000
Derivative liability 5,000,000 83,000,000
Other liabilities 0  
Total 5,000,000 83,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 0  
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Other U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 0  
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading liabilities 0  
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 5,000,000 81,000,000
Derivative liability 5,000,000 74,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Interest-rate contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 0
Derivative liability 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative asset 0 0
Derivative liability 0 9,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Other U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account assets 0 0
Investment securities available for sale 10,000,000 9,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | US Treasury and federal agencies, direct obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | US Treasury and federal agencies, mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Asset-backed securities, student loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 189,000,000 259,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Asset-backed securities, credit cards    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Asset-backed securities, sub-prime    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Asset-backed securities, other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,764,000,000 3,780,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Total asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,953,000,000 4,039,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. debt securities, mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. debt securities, asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 174,000,000 295,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. debt securities, other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 255,000,000 371,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Total non-U.S. debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 429,000,000 666,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | State and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 33,000,000 38,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 39,000,000 614,000,000
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | U.S. equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | U.S. money-market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Pricing Methods with Significant Unobservable Market Inputs (Level 3) | Recurring | Non-U.S. money-market mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale $ 0 $ 0