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Income Taxes (Income Taxes Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Income Tax Disclosure [Abstract] |  |  |  |  |
Net Earnings (Loss) Before Income Tax |  | $ 770 |  | $ 1,351 | $ 2,510
Expected Income Tax Expense (Recovery) and United States Federal Statutory Tax Rate |  | 162 |  |  |
Expected Income Tax Expense (Recovery) |  |  |  | 284 | 527
State and Local Income Tax, net of Federal Income Tax Effect |  | (27) | [1] | 15 | 23
Statutory tax rate difference between Canada and United States |  | 28 |  | (14) | 20
Provincial income tax | [2],[3] | (47) |  |  |
Non-taxable and non-deductible items: |  |  |  |  |
Commercial restructure | [3],[4] | (559) |  |  |
Other |  | 3 |  |  |
Effect of Cross-Border Tax Law: |  |  |  |  |
Global intangible low-taxed income |  | 9 |  |  |
Subpart F |  | (15) |  |  |
Unremitted earnings |  | (11) |  |  |
Base erosion and anti-abuse tax |  | (16) |  |  |
Foreign tax credits |  | (22) |  |  |
Tax Credits: |  |  |  |  |
Research & development credits |  | (59) |  | (67) | (128)
Non-taxable items |  |  |  | (5) | 10
Amounts in respect of prior periods |  |  |  | 5 | (19)
U.S. international tax |  |  |  | 40 | 8
Change in valuation allowance |  | 22 | [4] | (45) | (18)
Changes in Unrecognized Tax Benefits |  | 54 |  |  |
Other |  | 6 |  | 13 | 2
Income Tax Expense (Recovery) |  | $ (472) |  | $ 226 | $ 425
Expected Income Tax Expense (Recovery) and United States Federal Statutory Tax Rate |  | 21.00% |  | 21.00% | 21.00%
State and Local Income Tax, net of Federal Income Tax Effect | [1] | (3.50%) |  |  |
Statutory tax rate difference between Canada and United States |  | 3.60% |  |  |
Provincial income tax | [2],[3] | (6.10%) |  |  |
Non-taxable and non-deductible items: |  |  |  |  |
Commercial restructure | [3],[4] | (72.60%) |  |  |
Other |  | 0.40% |  |  |
Effect of Cross-Border Tax Law: |  |  |  |  |
Global intangible low-taxed income |  | 1.20% |  |  |
Subpart F |  | (1.90%) |  |  |
Unremitted earnings |  | (1.40%) |  |  |
Base erosion and anti-abuse tax |  | (2.10%) |  |  |
Foreign tax credits |  | (2.90%) |  |  |
Tax Credits: |  |  |  |  |
Research & development credits |  | (7.70%) |  |  |
Changes in Valuation Allowance | [4] | 2.90% |  |  |
Changes in Unrecognized Tax Benefits |  | 7.00% |  |  |
Other |  | 0.80% |  |  |
Effective Tax Rate |  | (61.30%) |  | 16.70% | 16.90%
[1] | Texas represents the majority (greater than 50 percent) of the tax effect.
[2] | Alberta represents the majority (greater than 50 percent) of the tax effect
[3] | The commercial restructure in Canada resulted in a capital loss utilization with a corresponding reduction of the valuation allowance and the recognition of a net deferred tax asset. In conjunction with the restructure, the Company recognized provincial income tax and a valuation allowance reversal of $520 million ($330 million federal and $190 million provincial).
[4] | The worldwide valuation allowance reversal of $498 million primarily resulted from the commercial restructure in Canada.

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