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Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes |  |  |
Income before tax | $ 1,181 | $ 1,039 | $ 513
Partnership earnings not subject to current Canadian tax | (1,046) | (909) | (509)
Partnership earnings subject to current Canadian tax | 135 | 130 | 4
Canadian federal and provincial corporate tax rate (as a percent) | 25.00% | 27.00% | 28.00%
Income tax at statutory rate | 34 | 35 | 1
Current tax (benefit)/expense: |  |  |
Canadian withholding tax | 18 | 12 |
Canadian period tax adjustments resulting from tax rate changes and tax return filings | (3) | (9) |
Canadian permanent differences between book and tax | 2 | (2) | (3)
State income tax | 2 | 2 | 1
Total current tax (benefit)/expense | 53 | 38 | (1)
Deferred tax expense: |  |  |
State deferred income tax (benefit)/expense |  | (2) | 1
Canadian deferred tax (benefit)/expense as a result of book versus tax differences | 1 | 9 | (1)
Deferred income tax expense | 1 | 7 |
Total income tax (benefit)/expense | 54 | 45 | (1)
Deferred tax assets: |  |  |
Book accruals in excess of current tax deductions | 28 | 18 |
Total deferred tax assets | 28 | 18 |
Deferred tax liabilities: |  |  |
Property and equipment in excess of tax values | (397) | (147) |
Total deferred tax liabilities | (397) | (147) |
Net deferred tax liabilities | (369) | (129) |
Increase in net deferred taxes liabilities | $ 236 |  |

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