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Derivative and Hedging Activities - Marketing, Gathering and Compression Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |
Gains on undesignated oil, natural gas and NGL derivatives | $ 5 | $ (34) |
Total oil, natural gas and NGL revenues | 8,595 | 10,030 | $ 10,039
Marketing, gathering and compression | Supply contract |  |  |
Derivative [Line Items] |  |  |
Gains on undesignated oil, natural gas and NGL derivatives | (4) | 7 | 0
Marketing |  |  |
Derivative [Line Items] |  |  |
Total oil, natural gas and NGL revenues | 3,967 | 5,076 | 4,511
Marketing | Marketing, gathering and compression |  |  |
Derivative [Line Items] |  |  |
Revenues | $ 3,971 | $ 5,069 | $ 4,511

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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