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Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 1,331 |  | $ 3,924 |
Losses on oil, natural gas and NGL derivatives | (132) |  | (500) |
Revenues | 2,418 | $ 1,943 | 7,162 | $ 6,977
Marcellus [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 184 |  | 646 |
Haynesville [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 195 |  | 605 |
Eagle Ford [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 493 |  | 1,411 |
Utica [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 266 |  | 718 |
Mid-Continent [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 85 |  | 301 |
Powder River Basin [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 108 |  | 243 |
Oil [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 594 |  | 1,698 |
Losses on oil, natural gas and NGL derivatives | (100) |  | (388) |
Oil [Member] | Marcellus [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 |  | 0 |
Oil [Member] | Haynesville [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 |  | 2 |
Oil [Member] | Eagle Ford [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 399 |  | 1,148 |
Oil [Member] | Utica [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 59 |  | 179 |
Oil [Member] | Mid-Continent [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 58 |  | 196 |
Oil [Member] | Powder River Basin [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 78 |  | 173 |
Natural gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 578 |  | 1,822 |
Losses on oil, natural gas and NGL derivatives | (18) |  | (85) |
Natural gas [Member] | Marcellus [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 184 |  | 646 |
Natural gas [Member] | Haynesville [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 195 |  | 603 |
Natural gas [Member] | Eagle Ford [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 36 |  | 120 |
Natural gas [Member] | Utica [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 131 |  | 350 |
Natural gas [Member] | Mid-Continent [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 15 |  | 63 |
Natural gas [Member] | Powder River Basin [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 17 |  | 40 |
NGL [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 159 |  | 404 |
Losses on oil, natural gas and NGL derivatives | (14) |  | (27) |
NGL [Member] | Marcellus [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 |  | 0 |
NGL [Member] | Haynesville [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 |  | 0 |
NGL [Member] | Eagle Ford [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 58 |  | 143 |
NGL [Member] | Utica [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 76 |  | 189 |
NGL [Member] | Mid-Continent [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 12 |  | 42 |
NGL [Member] | Powder River Basin [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 13 |  | 30 |
Oil, natrual gas and NGL [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,199 | 979 | 3,424 | 3,727
Oil, natrual gas and NGL [Member] | Oil [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 494 |  | 1,310 |
Oil, natrual gas and NGL [Member] | Natural gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 560 |  | 1,737 |
Oil, natrual gas and NGL [Member] | NGL [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 145 |  | 377 |
Marketing [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,030 |  | 3,182 |
Revenues | 1,219 | $ 964 | 3,738 | $ 3,250
Marketing [Member] | Oil [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 707 |  | 2,125 |
Revenues | 826 |  | 2,506 |
Marketing [Member] | Natural gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 211 |  | 733 |
Revenues | 281 |  | 908 |
Marketing [Member] | NGL [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 112 |  | 324 |
Revenues | 112 |  | 324 |
Other marketing revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 189 |  | 556 |
Other marketing revenue [Member] | Oil [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 119 |  | 381 |
Other marketing revenue [Member] | Natural gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 70 |  | 175 |
Other marketing revenue [Member] | NGL [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0 |  | $ 0 |

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