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Fair Value Measurement - Schedule of Fair Value Hierarchy for Gross Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 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 2,052 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 1,210 479
Commodity derivatives 2,052 1,243
Total assets 3,262 2,839
Commodity derivatives 2,056 1,223
Total liabilities 2,056 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 162 2
Commodity derivatives 957 562
Total assets 1,119 1,681
Commodity derivatives 1,004 593
Total liabilities 1,004 593
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 1,048 477
Commodity derivatives 1,037 619
Total assets 2,085 1,096
Commodity derivatives 867 543
Total liabilities 867 543
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 58 62
Total assets 58 62
Commodity derivatives 185 87
Total liabilities $ 185 $ 87