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Revenue Recognition - Disaggregated Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 4,517 | $ 5,189 |
Gains (losses) on oil, natural gas and NGL derivatives | 5 | (34) |
Total oil, natural gas and NGL revenues | 8,595 | 10,030 | $ 10,039
Marcellus |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 856 | 924 |
Haynesville |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 620 | 838 |
Eagle Ford |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,561 | 1,872 |
Brazos valley |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 769 |  |
Powder River Basin |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 478 | 350 |
Mid-Continent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 233 | 385 |
Utica |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 820 |
Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,543 | 2,201 |
Gains (losses) on oil, natural gas and NGL derivatives | (212) | 124 |
Oil | Marcellus |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 |
Oil | Haynesville |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 2 |
Oil | Eagle Ford |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,289 | 1,514 |
Oil | Brazos valley |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 721 |  |
Oil | Powder River Basin |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 369 | 244 |
Oil | Mid-Continent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 164 | 246 |
Oil | Utica |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 195 |
Natural gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,782 | 2,486 |
Gains (losses) on oil, natural gas and NGL derivatives | 217 | (147) |
Natural gas | Marcellus |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 856 | 924 |
Natural gas | Haynesville |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 620 | 836 |
Natural gas | Eagle Ford |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 153 | 173 |
Natural gas | Brazos valley |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 32 |  |
Natural gas | Powder River Basin |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 77 | 68 |
Natural gas | Mid-Continent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 44 | 84 |
Natural gas | Utica |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 401 |
NGL |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 192 | 502 |
Gains (losses) on oil, natural gas and NGL derivatives | 0 | (11) |
NGL | Marcellus |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 |
NGL | Haynesville |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 0 | 0 |
NGL | Eagle Ford |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 119 | 185 |
NGL | Brazos valley |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 16 |  |
NGL | Powder River Basin |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 32 | 38 |
NGL | Mid-Continent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 25 | 55 |
NGL | Utica |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers |  | 224 |
Oil, Natural Gas and NGL |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total oil, natural gas and NGL revenues | 4,522 | 5,155 | $ 4,985
Oil, Natural Gas and NGL | Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total oil, natural gas and NGL revenues | 2,331 | 2,325 |
Oil, Natural Gas and NGL | Natural gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total oil, natural gas and NGL revenues | 1,999 | 2,339 |
Oil, Natural Gas and NGL | NGL |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total oil, natural gas and NGL revenues | 192 | 491 |
Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,619 | 4,390 |
Gains (losses) on oil, natural gas and NGL derivatives | (4) | 7 |
Total oil, natural gas and NGL revenues | 3,967 | 5,076 |
Marketing | Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,473 | 2,740 |
Gains (losses) on oil, natural gas and NGL derivatives | 0 | 0 |
Total oil, natural gas and NGL revenues | 2,784 | 3,197 |
Marketing | Natural gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 900 | 1,194 |
Gains (losses) on oil, natural gas and NGL derivatives | (4) | 7 |
Total oil, natural gas and NGL revenues | 937 | 1,423 |
Marketing | NGL |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 246 | 456 |
Gains (losses) on oil, natural gas and NGL derivatives | 0 | 0 |
Total oil, natural gas and NGL revenues | 246 | 456 |
Other marketing revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total oil, natural gas and NGL revenues | 352 | 679 |
Other marketing revenue | Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total oil, natural gas and NGL revenues | 311 | 457 |
Other marketing revenue | Natural gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total oil, natural gas and NGL revenues | 41 | 222 |
Other marketing revenue | NGL |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total oil, natural gas and NGL revenues | $ 0 | $ 0 |

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