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Fair Value - Schedule of Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets $ 1,373   $ 924
Investment securities available for sale 85,308   94,913
Reduction in assets from netting and the result of cash collateral deposited with derivative counterparties 701 $ 983  
Reduction in liabilities from netting and the result of cash collateral received from derivative counterparties 1,240 $ 2,630  
Collateralized Loan Obligations      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 2,900   3,800
Automobile Loan Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 72   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 863   1,200
Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets 1,373   924
Investment securities available for sale 85,308   94,913
Derivative Asset, Gross Liability and Obligation to Return Cash, Offset (5,424)   (7,280)
Derivative assets 5,168   7,934
Assets, fair value disclosure 91,849   103,771
Derivative Liability, Gross Asset and Right to Reclaim Cash, Offset (5,963)   (8,926)
Derivative liabilities 4,366   6,308
Total liabilities carried at fair value 4,572   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 (5,373)   (7,211)
Derivative assets 5,166   7,924
Derivative Liability, Gross Asset and Right to Reclaim Cash, Offset (5,918)   (8,879)
Derivative liabilities 4,085   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 (48)   (68)
Derivative assets 1   9
Derivative Liability, Gross Asset and Right to Reclaim Cash, Offset (42)   (46)
Derivative liabilities 177   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 1   1
Derivative Liability, Gross Asset and Right to Reclaim Cash, Offset (3)   (1)
Derivative liabilities 104   69
Recurring | U.S. government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets 29   20
Trading liabilities 9    
Recurring | Non-U.S. government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets 789   378
Trading liabilities 193    
Recurring | Other U.S. debt securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading account assets 555   526
Investment securities available for sale 3,336   4,109
Trading liabilities 4    
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 12,902   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 19,718   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 14,204   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 9,139   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 1,569   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 491   951
Recurring | Asset-backed securities, other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 3,005   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 20,383   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 8,329   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 2,933   3,226
Recurring | Government securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 4,003   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 5,118   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 10,449   10,820
Recurring | Collateralized mortgage obligations      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment securities available for sale 3,984   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 39   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 282   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 837   418
Investment securities available for sale 12,346   10,056
Derivative Asset, Gross Asset 0   0
Assets, fair value disclosure 13,183   10,474
Derivative Liability, Gross Liability 0   0
Total liabilities carried at fair value 202   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 29   20
Trading liabilities 9    
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 789   378
Trading liabilities 193    
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 19   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 12,346   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 536   506
Investment securities available for sale 68,981   79,491
Derivative Asset, Gross Asset 10,532   15,133
Assets, fair value disclosure 80,049   95,130
Derivative Liability, Gross Liability 10,279   15,151
Total liabilities carried at fair value 10,283   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 10,479   15,054
Derivative Liability, Gross Liability 9,953   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 49   77
Derivative Liability, Gross Liability 219   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 4   2
Derivative Liability, Gross Liability 107   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
Trading liabilities 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 536   506
Investment securities available for sale 3,327   4,100
Trading liabilities 4    
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 556   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 19,718   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 11,037   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 8,905   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 1,569   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 491   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 72   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 19,829   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 8,232   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 2,740   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 4,003   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 4,854   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 10,413   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 3,769   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 39   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 282   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 4,041   5,447
Total liabilities carried at fair value 50   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 3,981   5,366
Derivative Asset, Gross Asset 60   81
Assets, fair value disclosure 4,041   5,447
Derivative Liability, Gross Liability 50   83
Total liabilities carried at fair value 50   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 60   81
Derivative Liability, Gross Liability 50   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
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 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 3,167   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 234   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 2,933   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 554   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 97   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 193   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 264   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 36   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 215   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