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Income Taxes - Details of Income Tax Provision (Recovery) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Canadian	$ 159	$ 170	$ 115
Foreign	301	200	163
Current income tax, Total	460	370	278
Canadian	(29)	(6)	7
Foreign	(71)	(40)	(83)
Deferred income tax, Total	(100)	(46)	(76)
Income tax provision, Total	$ 360	$ 324	$ 202

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.