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Oil and Natural Gas Property Transactions - Narrative (Details) shares in Millions, $ / Mcf in Millions, $ in Millions |  | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 01, 2019 USD ($) shares | Dec. 31, 2019 USD ($) a well | Dec. 31, 2019 USD ($) a well day $ / BTU $ / bbl | Dec. 31, 2018 USD ($) a well day $ / BTU | Dec. 31, 2017 USD ($) a well $ / Mcf
Business Acquisition [Line Items] |  |  |  |  |
Revenues |  |  | $ 8,595 | $ 10,030 | $ 10,039
Proceeds from divestitures of proved and unproved properties |  |  | 130 | 2,231 | 1,249
Gain (loss) on sale of oil and natural gas properties |  |  | $ 0 | 0 |
Consecutive trading days | day |  |  | 5 |  |
Natural gas |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Average sales price (in usd per unit) | $ / BTU |  |  | 2.82 |  |
Mid-Continent |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from divestitures of proved and unproved properties |  |  |  | 491 |
Gain (loss) on sale of oil and natural gas properties |  |  |  | $ 12 |
Area of land, net (in acres) | a |  |  |  | 238,500 |
Productive gas wells, number of wells, net | well |  |  |  | 3,200 |
Other properties |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from divestitures of proved and unproved properties |  |  |  | $ 37 | 350
Haynesville shale |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from divestitures of proved and unproved properties |  |  |  |  | 915
Gain (loss) on sale of oil and natural gas properties |  |  |  |  | $ 326
Area of land, net (in acres) | a |  |  |  |  | 119,500
Productive gas wells, number of wells, net | well |  |  |  |  | 576
Haynesville shale | Natural gas |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proved developed reserves (volume) | $ / Mcf |  |  |  |  | 80
Disposal group, disposed of by sale, not discontinued operations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from divestitures of proved and unproved properties |  |  | $ 130 |  |
Gain (loss) on sale of oil and natural gas properties |  |  | $ 46 |  |
Utica shale | Disposal group, disposed of by sale, not discontinued operations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Area of land, gross (in acres) | a |  | 1,500,000 | 1,500,000 |  |
Area of land, net (in acres) | a |  | 900,000 | 900,000 |  |
Productive gas wells, number of wells, net | well |  | 920 | 920 |  |
Consideration received |  | $ 1,868 | $ 1,868 |  |
Utica shale | Disposal group, disposed of by sale, not discontinued operations | Synthetic gas |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net rentable area (in acres) | a |  | 320,000 | 320,000 |  |
Future natural gas prices 2023 | Natural gas |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Average sales price (in usd per unit) | $ / BTU |  |  | 3.00 |  |
Future natural gas prices | Utica shale | Disposal group, disposed of by sale, not discontinued operations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration received |  |  |  | $ 100 |
Period of trading days | day |  |  |  | 20 |
Consecutive trading days | day |  |  |  | 30 |
2022 NYMEX natural gas | Future natural gas prices 2023 | Utica shale | Disposal group, disposed of by sale, not discontinued operations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Average sales price (in usd per unit) | $ / BTU |  |  |  | 3.25 |
2022 NYMEX natural gas | Future natural gas prices | Utica shale | Disposal group, disposed of by sale, not discontinued operations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Gain (loss) on sale of oil and natural gas properties |  |  | $ (273) |  |
Consideration received |  |  |  | $ 50 |
2022 NYMEX natural gas | Future natural gas prices 2022 | Utica shale | Disposal group, disposed of by sale, not discontinued operations |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Average sales price (in usd per unit) | $ / BTU |  |  |  | 3.00 |
Wildhorse resource development corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common stock issued in the merger (in shares) | shares | 717.4 |  |  |  |
Cash | $ 381 |  |  |  |
Revenues |  | $ 752 |  |  |
Operating expenses |  | 810 |  |  |
Other expenses |  | $ 83 |  |  |
Energy related derivative | Oil |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Average sales price (in usd per unit) | $ / bbl |  |  | 56.33 |  |
Energy related derivative | Future NYMEX oil prices 2023 | Oil |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Average sales price (in usd per unit) | $ / bbl |  |  | 61.17 |  |

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