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Derivative Financial Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Asset derivatives    
Asset derivatives gross amount $ 249 $ 182
Liability derivatives    
Liability derivatives gross amount (742) (669)
OTC derivatives
   
Asset derivatives    
Asset derivatives gross amount 61 66
Offsets of derivative assets under counterparty netting (38) (35)
Derivative asset offsets under cash collateral received (12) (22)
Derivative assets net amount on balance sheet 11 9
Derivative assets pledged under securities collateral (10) (4)
Derivative assets net amount 1 5
Liability derivatives    
Liability derivatives gross amount (61) (70)
Offsets of derivative liabilities under counterparty netting 38 35
Derivative liability offsets under cash collateral pledged (9) (2)
Derivative liabilities net amount on balance sheet (32) (37)
Derivative liabilities received under securities collateral 27 25
Derivative liabilities net amount $ (5) $ (12)