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Fair Value Measurement - FV Hierarchy (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Commodity derivative asset, gross | $ 322,000,000 | $ 450,000,000
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in Cenovus Energy |  | 1,462,000,000
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in Cenovus Energy | 2,111,000,000 | 1,462,000,000
Available for sale debt securities at fair value | 241,000,000 |
Commodity derivative asset, gross | 322,000,000 | 450,000,000
Total assets | 2,674,000,000 | 1,912,000,000
Commodity derivative liability, gross | 311,000,000 | 400,000,000
Total liabilities | 311,000,000 | 400,000,000
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 | 2,111,000,000 | 1,462,000,000
Available for sale debt securities at fair value | 25,000,000 |
Commodity derivative asset, gross | 172,000,000 | 236,000,000
Total assets | 2,308,000,000 | 1,698,000,000
Commodity derivative liability, gross | 174,000,000 | 225,000,000
Total liabilities | 174,000,000 | 225,000,000
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
Available for sale debt securities at fair value | 216,000,000 |
Commodity derivative asset, gross | 114,000,000 | 181,000,000
Total assets | 330,000,000 | 181,000,000
Commodity derivative liability, gross | 115,000,000 | 145,000,000
Total liabilities | 115,000,000 | 145,000,000
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
Available for sale debt securities at fair value | 0 |
Commodity derivative asset, gross | 36,000,000 | 33,000,000
Total assets | 36,000,000 | 33,000,000
Commodity derivative liability, gross | 22,000,000 | 30,000,000
Total liabilities | $ 22,000,000 | $ 30,000,000

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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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