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Fair Value Measurement - FV Hierarchy (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in Cenovus Energy | $ 809 | $ 2,111
Investments in debt securities | 482 | 241
Commodity derivative asset, gross | 301 | 322
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in Cenovus Energy | 809 | 2,111
Investments in debt securities | 482 | 241
Commodity derivative asset, gross | 301 | 322
Total assets | 1,592 | 2,674
Commodity derivative liability, gross | 277 | 311
Total liabilities | 277 | 311
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in Cenovus Energy | 809 | 2,111
Investments in debt securities | 21 | 25
Commodity derivative asset, gross | 173 | 172
Total assets | 1,003 | 2,308
Commodity derivative liability, gross | 173 | 174
Total liabilities | 173 | 174
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in Cenovus Energy | 0 | 0
Investments in debt securities | 461 | 216
Commodity derivative asset, gross | 117 | 114
Total assets | 578 | 330
Commodity derivative liability, gross | 89 | 115
Total liabilities | 89 | 115
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
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 derivative asset, gross | 11 | 36
Total assets | 11 | 36
Commodity derivative liability, gross | 15 | 22
Total liabilities | $ 15 | $ 22

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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