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Fair Value Measurement - Schedule of Net Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 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 | 1,210 | 479
Loans and advances—related parties | 59 | 114
Financial Liabilities [Abstract] |  |
Total debt, excluding finance leases | 15,687 | 18,673
Carrying Amount | Commodity Contract |  |
Financial Assets [Abstract] |  |
Commodity derivatives | 750 | 593
Financial Liabilities [Abstract] |  |
Commodity derivatives | 706 | 537
Estimate of Fair Value Measurement |  |
Financial Assets [Abstract] |  |
Investment in Cenovus Energy | 0 | 1,117
Investments in debt securities | 1,210 | 479
Loans and advances—related parties | 59 | 114
Financial Liabilities [Abstract] |  |
Total debt, excluding finance leases | 16,547 | 22,451
Estimate of Fair Value Measurement | Commodity Contract |  |
Financial Assets [Abstract] |  |
Commodity derivatives | 750 | 593
Financial Liabilities [Abstract] |  |
Commodity derivatives | $ 706 | $ 537

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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