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Income Taxes - Details of Income Tax Provision (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Canadian	$ 200us-gaap_CurrentFederalTaxExpenseBenefit	$ 159us-gaap_CurrentFederalTaxExpenseBenefit	$ 170us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	365us-gaap_CurrentForeignTaxExpenseBenefit	301us-gaap_CurrentForeignTaxExpenseBenefit	200us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax, Total	565us-gaap_CurrentIncomeTaxExpenseBenefit	460us-gaap_CurrentIncomeTaxExpenseBenefit	370us-gaap_CurrentIncomeTaxExpenseBenefit
Canadian	1	(29)	(6)
Foreign	93	(71)	(40)
Deferred income tax, Total	94us-gaap_DeferredIncomeTaxExpenseBenefit	(100)us-gaap_DeferredIncomeTaxExpenseBenefit	(46)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision, Total	$ 659us-gaap_IncomeTaxExpenseBenefit	$ 360us-gaap_IncomeTaxExpenseBenefit	$ 324us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.