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Derivative Positions Presented On Net Basis (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Gross amounts recognized in the consolidated balance sheet, asset $ 42 $ 56
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, asset (3) (2)
Total 39 54
Gross amounts recognized in the consolidated balance sheet, liability 3 2
Gross amount subject to offset in master netting arrangements not offset in the consolidated balance sheet, liability (3) (2)
Total $ 0 $ 0