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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2022
Income Tax Examination [Line Items]          
Income tax provision $ 105 $ 59 $ 334 $ 244  
Earnings before income taxes $ 565 $ 400 $ 1,637 $ 1,329  
Income tax rate reconciliation, percent 18.60% 14.80% 20.40% 18.40%  
Less: Net earnings attributable to noncontrolling interests $ 107 $ 65 $ 252 $ 195  
Effect of ongoing tax audits on income tax expense     $ 21    
Income tax rate increase/(decrease) during period due to noncontrolling interest 4.30% 2.90% 3.70% 3.10%  
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent     1.30%    
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount   $ 9      
Income Tax Examination, Interest Refund   3      
Tax Adjustments, Settlements, and Unusual Provisions   37      
Tax Years 2006-2011 | Canada Revenue Agency and Alberta Tax and Revenue Administration | Foreign Tax Jurisdiction          
Income Tax Examination [Line Items]          
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority   40   $ 40  
Proceeds from Income Tax Refund, Foreign   37      
Income Tax Examination, Interest Refund   $ 3      
Tax Years 2006-2011 | Canada Revenue Agency | Foreign Tax Jurisdiction          
Income Tax Examination [Line Items]          
Income Tax Examination, Interest Expense         $ 124
Tax Years 2006-2011 | Alberta Tax and Revenue Administration | Foreign Tax Jurisdiction          
Income Tax Examination [Line Items]          
Income Tax Examination, Interest Expense         $ 100