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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

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