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Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes |  |  |
Income before tax | $ 1,490 | $ 1,181 | $ 1,039
Partnership earnings not subject to current Canadian tax | (1,187) | (1,046) | (909)
Partnership earnings subject to current Canadian tax | 303 | 135 | 130
Canadian federal and provincial corporate tax rate (as a percent) | 25.00% | 25.00% | 27.00%
Income tax at statutory rate | 76 | 34 | 35
Canadian withholding taxes | 19 | 18 | 12
Canadian permanent differences and rate changes | 3 |  | (2)
State income tax | 1 | 2 |
Total income tax expense | 99 | 54 | 45
Deferred tax assets: |  |  |
Book accruals in excess of current tax deductions | 56 | 28 |
Total deferred tax assets | 56 | 28 |
Deferred tax liabilities: |  |  |
Property and equipment in excess of tax values | (398) | (397) |
Total deferred tax liabilities | (398) | (397) |
Net deferred tax liabilities | $ (342) | $ (369) |

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- Definition The amount of foreign income tax expense or benefit for the period computed by applying the foreign statutory tax rates to foreign pretax income from continuing operations. + References No definition available. + Details
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- Definition This element represents the rate at which the foreign income of an entity is charged to tax as per the enacted tax laws. + References No definition available. + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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