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Derivative Financial Instruments - Gross Positions with Impact of Netting Agreements (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Other Assets [Member]
Dec. 31, 2012
Other Assets [Member]
Dec. 31, 2013
Other Liabilities [Member]
Jan. 31, 2012
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]            
Gross position, Assets $ 2,010 $ 2,785 $ 2,010 $ 2,785    
Impact of master netting agreements, Assets     (386) (544)    
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets     1,624 2,241    
Cash collateral (held) pledged, Assets     (687) (1,423)    
Net position, Assets     937 818    
Gross position, Liabilities (1,957) (2,499)     (1,957) (2,499)
Impact of master netting agreements, Liabilities         386 544
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities         (1,571) (1,955)
Cash collateral (held) pledged, Liabilities         777 973
Net position, Liabilities         $ (794) $ (982)