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Income Taxes Incomes Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Operating Loss Carryforwards [Line Items]        
Income tax provision (benefit) $ 23 $ 155 $ 326 $ 913
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 253 $ 693 $ 1,812 $ 3,841
Effective Income Tax Rate Reconciliation, Percent 9.10% 22.30% 18.00% 23.80%
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount   $ 9    
Less: Net earnings attributable to noncontrolling interest $ 66 $ 100 $ 235 $ 442
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount       $ 22
Effective Income Tax Rate Reconciliation, period increase/(decrease) due to noncontrolling interest 3.20% 3.70% 2.70% 3.10%
Income Tax Examination, Interest Expense   $ 1    
Income Taxes Paid       $ 224
Foreign Tax Authority | Canada Revenue Agency        
Operating Loss Carryforwards [Line Items]        
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount       78
Foreign Tax Authority | Canada Revenue Agency | Tax Years 2006-2011        
Operating Loss Carryforwards [Line Items]        
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority   129   129
Unrecognized Tax Benefits, Interest on Income Taxes Accrued   103   103
Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount       78
Foreign Tax Authority | Canada Revenue Agency | Tax Years 2012 and After        
Operating Loss Carryforwards [Line Items]        
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions       314
Income Taxes Receivable, Noncurrent   359   359
Unrecognized Tax Benefits, Income Tax Penalties Accrued   123   123
Accrued Income Taxes, Noncurrent   33   33
Foreign Tax Authority | Canada Revenue Agency | Tax Year 2012 and After        
Operating Loss Carryforwards [Line Items]        
Income Tax Examination, Interest Expense   4   90
Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount   3   16
Income Tax Examination, Estimate of Possible Loss       29
Unrecognized Tax Benefits, Estimated Interest on Income Taxes Accrued, Net of Taxes   98   98
Income Tax Examination, Interest Expense, Net of Taxes   5    
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC)        
Operating Loss Carryforwards [Line Items]        
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   18   18
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Income Taxes Receivable   $ 51   $ 51