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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers Disaggregated Based on Type of Good) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | $ 4,673 | $ 6,674 | $ 8,439
Revenues | 4,673 | 6,674 | 8,439
Oil, Gas and NGL Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 2,695 | 3,809 | 4,085
Revenues | 2,695 | 3,809 | 4,085
Oil, Gas and NGL Sales [Member] | Oil [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 2,034 | 2,988 | 2,941
Revenues | 2,034 | 2,988 | 2,941
Oil, Gas and NGL Sales [Member] | Gas [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 326 | 391 | 482
Revenues | 326 | 391 | 482
Oil, Gas and NGL Sales [Member] | NGL [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 335 | 430 | 662
Revenues | 335 | 430 | 662
Marketing and Midstream Revenues [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 1,978 | 2,865 | 4,354
Revenues | 1,978 | 2,865 | 4,354
Marketing and Midstream Revenues [Member] | Oil [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 936 | 1,534 | 2,745
Revenues | 936 | 1,534 | 2,745
Marketing and Midstream Revenues [Member] | Gas [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 488 | 645 | 738
Revenues | 488 | 645 | 738
Marketing and Midstream Revenues [Member] | NGL [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenues from contracts with customers | 554 | 686 | 871
Revenues | $ 554 | $ 686 | $ 871

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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 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: 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=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: 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=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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