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Fair Value Measurement - Fair Value Hierarchy for Gross Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 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 2,037 1,243
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Cenovus Energy 1,117
Investments in debt securities 1,222 479
Commodity derivatives 2,037 1,243
Total assets 3,259 2,839
Commodity derivatives 2,010 1,223
Total liabilities 2,010 1,223
Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Cenovus Energy 1,117
Investments in debt securities 178 2
Commodity derivatives 958 562
Total assets 1,136 1,681
Commodity derivatives 906 593
Total liabilities 906 593
Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Cenovus Energy 0
Investments in debt securities 1,044 477
Commodity derivatives 951 619
Total assets 1,995 1,096
Commodity derivatives 843 543
Total liabilities 843 543
Level 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment in Cenovus Energy 0
Investments in debt securities 0 0
Commodity derivatives 128 62
Total assets 128 62
Commodity derivatives 261 87
Total liabilities $ 261 $ 87