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Netting Arrangements for Certain Financial Instruments and Securities Financing Activities - Information on Company's Accounting Netting Adjustments and Items Not Offset in Consolidated Balance Sheet Assets But Available for Offset in Event of Default (Parenthetical) (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Offsetting [Abstract]    
Cash collateral netted against derivative assets $ 210 $ 165
Derivative assets not subject to netting arrangements $ 848 $ 368