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Revenue - Disaggregated Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 672 | $ 1,003 | $ 2,006 | $ 3,412
Gains (losses) on oil, natural gas and NGL derivatives | (161) | 167 | 573 | 141
Revenues | 975 | 2,087 | 4,037 | 6,669
Oil, natural gas and NGL revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 511 | 1,170 | 2,579 | 3,553
Marketing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 805 | 1,344 | 2,773
Gains (losses) on oil, natural gas and NGL derivatives |  |  |  | (3)
Revenues | 448 | 889 | 1,412 | 3,038
Other marketing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 84 | 68 | 268
Marcellus |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 137 | 158 | 445 | 657
Haynesville |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 92 | 129 | 245 | 494
Eagle Ford |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 241 | 336 | 675 | 1,167
Brazos Valley |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 133 | 209 | 394 | 548
Powder River Basin |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 47 | 118 | 175 | 355
Mid-Continent |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22 | 53 | 72 | 191
Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 366 | 613 | 1,091 | 1,879
Gains (losses) on oil, natural gas and NGL derivatives | (2) | 124 | 689 | (49)
Oil | Oil, natural gas and NGL revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 364 | 737 | 1,780 | 1,830
Oil | Marketing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 603 | 930 | 1,830
Gains (losses) on oil, natural gas and NGL derivatives |  |  |  | 0
Revenues | 301 | 683 | 997 | 2,060
Oil | Other marketing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 80 | 67 | 230
Oil | Marcellus |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Oil | Haynesville |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Oil | Eagle Ford |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 189 | 282 | 539 | 962
Oil | Brazos Valley |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 127 | 194 | 375 | 513
Oil | Powder River Basin |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36 | 97 | 133 | 273
Oil | Mid-Continent |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14 | 40 | 44 | 131
Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 270 | 353 | 824 | 1,384
Gains (losses) on oil, natural gas and NGL derivatives | (159) | 43 | (116) | 190
Natural Gas | Oil, natural gas and NGL revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 111 | 396 | 708 | 1,574
Natural Gas | Marketing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 165 | 338 | 741
Gains (losses) on oil, natural gas and NGL derivatives |  |  |  | (3)
Revenues | 116 | 169 | 339 | 776
Natural Gas | Other marketing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 4 | 1 | 38
Natural Gas | Marcellus |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 137 | 158 | 445 | 657
Natural Gas | Haynesville |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 92 | 129 | 245 | 494
Natural Gas | Eagle Ford |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 26 | 32 | 77 | 117
Natural Gas | Brazos Valley |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3 | 10 | 10 | 23
Natural Gas | Powder River Basin |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7 | 16 | 28 | 59
Natural Gas | Mid-Continent |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5 | 8 | 19 | 34
NGL |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36 | 37 | 91 | 149
Gains (losses) on oil, natural gas and NGL derivatives | 0 | 0 | 0 | 0
NGL | Oil, natural gas and NGL revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36 | 37 | 91 | 149
NGL | Marketing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 37 | 76 | 202
Gains (losses) on oil, natural gas and NGL derivatives |  |  |  | 0
Revenues | 31 | 37 | 76 | 202
NGL | Other marketing revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | 0 | 0 | 0
NGL | Marcellus |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
NGL | Haynesville |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
NGL | Eagle Ford |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 26 | 22 | 59 | 88
NGL | Brazos Valley |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3 | 5 | 9 | 12
NGL | Powder River Basin |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4 | 5 | 14 | 23
NGL | Mid-Continent |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 3 | $ 5 | $ 9 | $ 26

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