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Income Taxes - Reconciliation and Deferred Tax Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Examination [Line Items] |  |  |
Income before tax | $ 2,414 | $ 902 | $ 755
Partnership earnings not subject to current Canadian tax | (1,690) | (756) | (723)
Partnership earnings subject to current Canadian tax | $ 724 | $ 146 | $ 32
Canadian federal and provincial corporate tax rate | 27.00% | 27.00% | 27.00%
Income tax at statutory rate | $ 195 | $ 39 | $ 8
Canadian withholding tax | 0 | 2 | 13
Canadian permanent differences and rate changes | 0 | 2 | 2
State income tax | 3 | 1 | 2
Total income tax expense | 198 | 44 | $ 25
Deferred tax assets: |  |  |
Derivative instruments | 0 | 74 |
Book accruals in excess of current tax deductions | 21 | 22 |
Net operating losses | 2 | 3 |
Total deferred tax assets | 23 | 99 |
Deferred tax liabilities: |  |  |
Property and equipment in excess of tax values | (449) | (455) |
Derivative instruments | (31) |  |
Other | (42) | (50) |
Total deferred tax liabilities | (522) | (505) |
Net deferred tax liabilities | (499) | (406) |
Other long-term assets, net |  |  |
Deferred tax liabilities: |  |  |
Net deferred tax assets | 2 | 3 |
Other long-term liabilities and deferred credits |  |  |
Deferred tax liabilities: |  |  |
Net deferred tax liabilities | $ (501) | $ (409) |

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