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Derivatives and Hedging Activities (Details Textuals) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Derivatives and Hedging Activities (Textuals) [Abstract]      
Net reduction in interest expense on long term debt and other $ 69,000,000 $ 112,000,000  
Derivative asset not offset 0   0
Derivative liabilities not offset 0   0
Shares held in equity investment 107.5   180.7
Margin On Interest Rate Swap Not Netted 50,000,000   26,000,000
Derivative [Line Items]      
Equity investment 68,000,000   124,000,000
Net Investment Hedging [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Net hedge ineffectiveness 0 0  
Net Investment Hedging [Member] | Other Expense [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount reclassified from AOCI into income 17,000,000 0  
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
      
Derivative [Line Items]      
Equity investment 66,000,000   122,000,000
Fair Value Hedges [Member]
      
Derivative [Line Items]      
Notional amount of long-term debt 15,900,000,000   14,700,000,000
Net Investment Hedges [Member]
      
Derivative [Line Items]      
Effective portion of gain (loss) on hedges (17,000,000) (56,000,000)  
Credit Valuation Adjustment [Member]
      
Derivative [Line Items]      
Notional amount of long-term debt $ 0   $ 0