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Derivative Financial Instruments (Schedule of The Fair Values of Derivative Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets $ 6,699 $ 11,977 [1]
Fair value of derivative liabilities 6,694 [1] 11,811 [1]
Foreign exchange contracts
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 6,637 11,911 [1]
Fair value of derivative liabilities 6,356 [1] 11,471 [1]
Interest-rate contracts
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 58 65 [1]
Fair value of derivative liabilities 270 [1] 331 [1]
Derivatives not designated as hedging instruments | Other assets
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 6,369 11,582
Derivatives not designated as hedging instruments | Other liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 6,410 11,480
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other assets
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 6,346 11,552
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 6,322 11,428
Derivatives not designated as hedging instruments | Interest-rate contracts | Other assets
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 19 29
Derivatives not designated as hedging instruments | Interest-rate contracts | Other liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 20 29
Derivatives not designated as hedging instruments | Other derivative contracts | Other assets
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 4 1
Derivatives not designated as hedging instruments | Other derivative contracts | Other liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 68 23
Derivatives designated as hedging instruments | Other assets
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 330 395
Derivatives designated as hedging instruments | Other liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 284 345
Derivatives designated as hedging instruments | Foreign exchange contracts | Other assets
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 291 359
Derivatives designated as hedging instruments | Foreign exchange contracts | Other liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 34 43
Derivatives designated as hedging instruments | Interest-rate contracts | Other assets
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 39 36
Derivatives designated as hedging instruments | Interest-rate contracts | Other liabilities
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities $ 250 $ 302
[1] Amounts include all transactions regardless of whether or not they are subject to an enforceable netting arrangement.