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Income Taxes - Reconciliation and Deferred Tax Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Examination [Line Items] |  |  |
Income before tax | $ 1,280 | $ 1,623 | $ 1,417
Partnership earnings not subject to Canadian tax | (837) | (1,136) | (686)
Partnership earnings subject to Canadian tax | $ 443 | $ 487 | $ 731
Canadian federal and provincial corporate tax rate | 24.00% | 24.00% | 24.00%
Income tax expense at statutory rate | $ 106 | $ 117 | $ 175
Canadian withholding tax | 52 |  |
Canadian permanent differences | 7 | 2 | 13
State income tax | 2 | 2 | 1
Total income tax expense | 167 | 121 | $ 189
Deferred tax assets: |  |  |
Derivative instruments | 19 | 0 |
Lease liabilities | 46 | 40 |
Other | 43 | 45 |
Total deferred tax assets | 108 | 85 |
Deferred tax liabilities: |  |  |
Property and equipment in excess of tax values | (525) | (573) |
Derivative instruments | 0 | (6) |
Lease assets | (44) | (38) |
Other | (3) | (3) |
Total deferred tax liabilities | (572) | (620) |
Net deferred tax liabilities | (464) | (535) |
Other long-term liabilities and deferred credits |  |  |
Deferred tax liabilities: |  |  |
Other long-term liabilities and deferred credits | $ (464) | $ (535) |

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