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Netting Arrangements for Certain Financial Instruments - Information on Company's Accounting Netting Adjustments and Items Not Offset in Consolidated Balance Sheet But Available for Offset in Event of Default (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Offsetting [Abstract]    
Cash collateral netted against derivative assets $ 76 $ 124
Derivative assets not subject to netting arrangements 179 55
Cash collateral netted against derivative liabilities 791 717
Derivative liabilities not subject to netting arrangements $ 189 $ 119