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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current tax expense:
State income tax	$ 1	$ 2	$ 2
Canadian federal and provincial income tax	99	51	36
Total current tax expense	100	53	38
Deferred tax (benefit)/expense:
State income tax			(2)
Canadian federal and provincial income tax	(1)	1	9
Total deferred tax (benefit)/expense	(1)	1	7
Total income tax expense	$ 99	$ 54	$ 45

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

Amount of current state and local 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.

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