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Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | $ 1,179 | $ 1,233 |  | $ 2,409 | $ 2,593 |
Gains (losses) on oil, natural gas and NGL derivatives | 275 | (251) |  | (26) | (368) |
Revenues | 2,386 | 2,289 | [1] | 4,582 | 4,813 | [1]
Oil, natural gas and NGL |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 1,454 | 982 | [1] | 2,383 | 2,225 | [1]
Marketing |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 824 | 1,069 |  | 1,967 | 2,158 |
Gains (losses) on oil, natural gas and NGL derivatives | (1) |  |  | (3) |  |
Revenues | 916 | 1,273 | [1] | 2,149 | 2,519 | [1]
Other marketing revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 93 | 204 |  | 185 | 361 |
Marcellus |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 198 | 169 |  | 500 | 462 |
Haynesville |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 164 | 199 |  | 365 | 411 |
Eagle Ford |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 406 | 478 |  | 831 | 919 |
Brazos Valley |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 213 |  |  | 340 |  |
Powder River Basin |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 128 | 72 |  | 237 | 135 |
Mid-Continent |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 70 | 89 |  | 136 | 215 |
Utica |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 226 |  |  | 451 |
Oil |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 700 | 567 |  | 1,266 | 1,104 |
Gains (losses) on oil, natural gas and NGL derivatives | 86 | (202) |  | (173) | (288) |
Oil | Oil, natural gas and NGL |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 786 | 365 |  | 1,093 | 816 |
Oil | Marketing |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 614 | 732 |  | 1,227 | 1,418 |
Gains (losses) on oil, natural gas and NGL derivatives | 0 |  |  | 0 |  |
Revenues | 692 | 877 |  | 1,377 | 1,680 |
Oil | Other marketing revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 78 | 145 |  | 150 | 262 |
Oil | Marcellus |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 0 | 0 |  | 0 | 0 |
Oil | Haynesville |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 0 | 1 |  | 0 | 2 |
Oil | Eagle Ford |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 349 | 390 |  | 680 | 750 |
Oil | Brazos Valley |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 199 |  |  | 320 |  |
Oil | Powder River Basin |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 102 | 52 |  | 176 | 95 |
Oil | Mid-Continent |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 50 | 62 |  | 90 | 138 |
Oil | Utica |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 62 |  |  | 119 |
Natural Gas |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 436 | 538 |  | 1,031 | 1,244 |
Gains (losses) on oil, natural gas and NGL derivatives | 189 | (35) |  | 147 | (67) |
Natural Gas | Oil, natural gas and NGL |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 625 | 503 |  | 1,178 | 1,177 |
Natural Gas | Marketing |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 162 | 235 |  | 575 | 528 |
Gains (losses) on oil, natural gas and NGL derivatives | (1) |  |  | (3) |  |
Revenues | 176 | 294 |  | 607 | 627 |
Natural Gas | Other marketing revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 15 | 59 |  | 35 | 99 |
Natural Gas | Marcellus |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 198 | 169 |  | 500 | 462 |
Natural Gas | Haynesville |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 164 | 198 |  | 365 | 409 |
Natural Gas | Eagle Ford |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 37 | 42 |  | 85 | 84 |
Natural Gas | Brazos Valley |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 9 |  |  | 13 |  |
Natural Gas | Powder River Basin |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 18 | 11 |  | 43 | 23 |
Natural Gas | Mid-Continent |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 10 | 15 |  | 25 | 47 |
Natural Gas | Utica |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 103 |  |  | 219 |
NGL |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 43 | 128 |  | 112 | 245 |
Gains (losses) on oil, natural gas and NGL derivatives | 0 | (14) |  | 0 | (13) |
NGL | Oil, natural gas and NGL |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 43 | 114 |  | 112 | 232 |
NGL | Marketing |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 48 | 102 |  | 165 | 212 |
Gains (losses) on oil, natural gas and NGL derivatives | 0 |  |  | 0 |  |
Revenues | 48 | 102 |  | 165 | 212 |
NGL | Other marketing revenue |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 0 | 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 | 20 | 46 |  | 66 | 85 |
NGL | Brazos Valley |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 5 |  |  | 7 |  |
NGL | Powder River Basin |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | 8 | 9 |  | 18 | 17 |
NGL | Mid-Continent |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | $ 10 | 12 |  | $ 21 | 30 |
NGL | Utica |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | $ 61 |  |  | $ 113 |
[1] | Financial information for 2018 has been recast to reflect the retrospective application of the successful efforts method of accounting. See Note 1.

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