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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Current tax (benefit)/expense: |  |  |
State income tax | $ 2 | $ 2 | $ 1
Canadian federal and provincial income tax | 51 | 36 | (2)
Total current tax (benefit)/expense | 53 | 38 | (1)
Deferred tax expense: |  |  |
State income tax |  | (2) | 1
Canadian federal and provincial income tax | 1 | 9 | (1)
Deferred income tax expense | 1 | 7 |
Total income tax (benefit)/expense | $ 54 | $ 45 | $ (1)

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