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Fair Value Measurement - Schedule of Fair Value Hierarchy for Gross Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Cenovus Energy $ 0 $ 1,117
Commodity derivatives 1,942 1,243
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Cenovus Energy 0 1,117
Investments in debt securities 1,197 479
Commodity derivatives 1,942 1,243
Total assets 3,139 2,839
Commodity derivatives 1,888 1,223
Total liabilities 1,888 1,223
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Cenovus Energy 0 1,117
Investments in debt securities 169 2
Commodity derivatives 919 562
Total assets 1,088 1,681
Commodity derivatives 927 593
Total liabilities 927 593
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Cenovus Energy 0 0
Investments in debt securities 1,028 477
Commodity derivatives 977 619
Total assets 2,005 1,096
Commodity derivatives 772 543
Total liabilities 772 543
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Cenovus Energy 0 0
Investments in debt securities 0 0
Commodity derivatives 46 62
Total assets 46 62
Commodity derivatives 189 87
Total liabilities $ 189 $ 87