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Fair Value Measurement - Schedule of Net Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Financial Assets [Abstract]    
Investment in Cenovus Energy $ 0 $ 1,117
Carrying Amount    
Financial Assets [Abstract]    
Investment in Cenovus Energy 0 1,117
Investments in debt securities 1,197 479
Loans and advances—related parties 0 114
Financial Liabilities [Abstract]    
Total debt, excluding finance leases 15,679 18,673
Carrying Amount | Commodity Contract    
Financial Assets [Abstract]    
Commodity derivatives 842 593
Financial Liabilities [Abstract]    
Commodity derivatives 757 537
Estimate of Fair Value Measurement    
Financial Assets [Abstract]    
Investment in Cenovus Energy 0 1,117
Investments in debt securities 1,197 479
Loans and advances—related parties 0 114
Financial Liabilities [Abstract]    
Total debt, excluding finance leases 15,755 22,451
Estimate of Fair Value Measurement | Commodity Contract    
Financial Assets [Abstract]    
Commodity derivatives 842 593
Financial Liabilities [Abstract]    
Commodity derivatives $ 757 $ 537