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Fair Value - Schedule of Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets $ 1,223   $ 924
Investment securities available for sale 80,097   94,913
Reduction in assets from netting and the result of cash collateral deposited with derivative counterparties 842 $ 983  
Reduction in liabilities from netting and the result of cash collateral received from derivative counterparties 1,750 $ 2,630  
Collateralized Loan Obligations      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 1,900   3,800
Automobile Loan Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 12   315
Non-US Debt Securities, Covered Bonds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 3,300   3,300
Non-U.S. debt securities, other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 763   1,200
Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets 1,223   924
Investment securities available for sale 80,097   94,913
Derivative Asset, Gross Liability and Obligation to Return Cash, Offset (5,584)   (7,280)
Derivative assets 5,387   7,934
Assets, fair value disclosure 86,707   103,771
Derivative Liability, Gross Asset and Right to Reclaim Cash, Offset (6,493)   (8,926)
Derivative liabilities 4,116   6,308
Total liabilities carried at fair value 4,219   6,308
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 (5,364)   (7,211)
Derivative assets 5,370   7,924
Derivative Liability, Gross Asset and Right to Reclaim Cash, Offset (6,451)   (8,879)
Derivative liabilities 3,846   6,046
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 (217)   (68)
Derivative assets 15   9
Derivative Liability, Gross Asset and Right to Reclaim Cash, Offset (39)   (46)
Derivative liabilities 168   193
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 (3)   (1)
Derivative assets 2   1
Derivative Liability, Gross Asset and Right to Reclaim Cash, Offset (3)   (1)
Derivative liabilities 102   69
Recurring | U.S. government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets 71   20
Recurring | Non-U.S. government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets 666   378
Trading liabilities 94    
Recurring | Other U.S. debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets 486   526
Investment securities available for sale 2,907   4,109
Trading liabilities 9    
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 13,354   10,655
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 18,829   20,714
Recurring | Total asset-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 11,561   20,609
Recurring | Asset-backed securities, student loans      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 7,644   12,460
Recurring | Asset-backed securities, credit cards      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 1,504   3,053
Recurring | Asset-backed securities, sub-prime      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 458   951
Recurring | Asset-backed securities, other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 1,955   4,145
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 19,827   22,169
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 7,916   9,606
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 3,198   3,226
Recurring | Government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 3,711   3,909
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 5,002   5,428
Recurring | State and political subdivisions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 9,974   10,820
Recurring | Collateralized mortgage obligations      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 3,299   5,339
Recurring | U.S. equity securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 37   39
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   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 298   449
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 8   8
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 751   418
Investment securities available for sale 12,817   10,056
Derivative Asset, Gross Asset 0   0
Assets, fair value disclosure 13,568   10,474
Derivative Liability, Gross Liability 0   0
Total liabilities carried at fair value 94   0
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, Gross Asset 0   0
Derivative Liability, Gross 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, Gross Asset 0   0
Derivative Liability, Gross 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, Gross Asset 0   0
Derivative Liability, Gross 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 71   20
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 666   378
Trading liabilities 94    
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 14   20
Investment securities available for sale 0   0
Trading liabilities 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 12,817   10,056
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 | 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 | 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 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 | 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 | 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 472   506
Investment securities available for sale 64,375   79,491
Derivative Asset, Gross Asset 10,950   15,133
Assets, fair value disclosure 75,797   95,130
Derivative Liability, Gross Liability 10,587   15,151
Total liabilities carried at fair value 10,596   15,151
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, Gross Asset 10,713   15,054
Derivative Liability, Gross Liability 10,275   14,851
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, Gross Asset 232   77
Derivative Liability, Gross Liability 207   239
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, Gross Asset 5   2
Derivative Liability, Gross Liability 105   61
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
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 account assets 472   506
Investment securities available for sale 2,898   4,100
Trading liabilities 9    
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 537   599
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 18,829   20,714
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 9,388   16,570
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 7,414   12,201
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 1,504   3,053
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 458   951
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 12   365
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 19,287   21,503
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 7,916   9,606
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 2,921   2,931
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 3,711   3,909
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 4,739   5,057
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 9,939   10,782
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 3,151   4,725
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 37   39
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   2
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 298   449
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 8   8
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 2,926   5,447
Total liabilities carried at fair value 22   83
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 2,905   5,366
Derivative Asset, Gross Asset 21   81
Assets, fair value disclosure 2,926   5,447
Derivative Liability, Gross Liability 22   83
Total liabilities carried at fair value 22   83
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, Gross Asset 21   81
Derivative Liability, Gross Liability 22   74
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, Gross Asset 0   0
Derivative Liability, Gross 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, Gross Asset 0   0
Derivative Liability, Gross Liability 0   9
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
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 account assets 0   0
Investment securities available for sale 9   9
Trading liabilities 0    
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 | Total asset-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 2,173   4,039
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 230   259
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 1,943   3,780
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 540   666
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 277   295
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 263   371
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 35   38
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 148   614
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