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Derivatives and Hedging Activities (Details Textuals) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Derivatives and Hedging Activities (Textuals) [Abstract]          
Net reduction in interest expense on long term debt and other $ 74,000,000 $ 76,000,000 $ 217,000,000 $ 280,000,000  
Derivative asset not offset 0   0   0
Derivative liabilities not offset 0   0   0
Shares held in equity investment sold 34.3   34.3   180.7
Margin On Interest Rate Swap Not Netted 97,000,000   97,000,000   26,000,000
Derivative [Line Items]          
Equity investment 1,000,000   1,000,000   124,000,000
Not Sold Or Repledged [Member]
          
Derivative [Line Items]          
Securities received as collateral 111,000,000   111,000,000   0
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
          
Derivative [Line Items]          
Equity investment 0   0   122,000,000
Fair Value Hedges [Member]
          
Derivative [Line Items]          
Notional amount of long-term debt 18,200,000,000   18,200,000,000   14,700,000,000
Net Investment Hedges [Member]
          
Derivative [Line Items]          
Effective portion of gain (loss) on hedges 246,000,000 (123,000,000) 113,000,000 160,000,000  
Net Investment Hedges [Member] | Net Investment Hedging [Member] | Other Expense [Member]
          
Derivative [Line Items]          
Amount reclassified from AOCI into income (1,000,000) 0 9,000,000 0  
Credit Valuation Adjustment [Member]
          
Derivative [Line Items]          
Notional amount of long-term debt $ 0   $ 0   $ 0