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Derivative Positions Presented On Net Basis (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Gross amounts recognized in the consolidated balance sheet, asset $ 56 $ 140
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, asset (2) (22)
Total 54 118
Gross amounts recognized in the consolidated balance sheet, liability 2 23
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, liability $ (2) (22)
Total   $ 1