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Income Taxes - Details of Income Tax Provision (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |
Canadian | $ 140 | $ 196
Foreign | 578 | 374
Current income tax, Total | 718 | 570
Canadian | 14 | 1
Foreign | (21) | 112
Deferred income tax, Total | (7) | 113
Income tax provision, Total | $ 711 | $ 683

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