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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.