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Oil and Natural Gas Property Transactions - Narrative (Details) shares in Millions, $ in Millions |  |  |  | 3 Months Ended | 11 Months Ended | 12 Months Ended
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Dec. 11, 2020 USD ($) | Nov. 22, 2020 USD ($) a well | Feb. 01, 2019 USD ($) shares | Dec. 31, 2020 USD ($) a well | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) a well | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) a well | Dec. 31, 2020 USD ($) a well $ / bbl $ / BTU | Dec. 31, 2019 USD ($) a day well $ / BTU | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 30 | $ 43 | $ (264)
Total revenues |  |  |  | $ 1,259 | $ 975 | $ 521 | $ 2,541 | $ 1,926 | $ 2,087 | $ 2,386 | $ 2,196 |  | 5,296 | 8,595 | 10,030
Proceeds from divestitures of proved and unproved properties |  |  |  |  |  |  |  |  |  |  |  |  | $ 136 | 130 | $ 2,231
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 |  |  |  | 238,500 |  | 238,500 |
Productive gas wells, number of wells, net | well |  |  |  |  |  |  |  | 3,200 |  |  |  | 3,200 |  | 3,200 |
Other properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestitures of proved and unproved properties |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37 |
Future natural gas prices 2023 | Natural gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 3.6 |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | $ 381 |  |  |  |  |  |  |  |  |  |  | 381 |
Total 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 |  |
Haynesville Exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of producing wells with interest | well |  | 144 |  |  |  |  |  |  |  |  |  |  |  |  |
Area of land with interest | a |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from exchange transaction |  | $ 128 |  |  |  |  |  |  |  |  |  |  |  |  |
Mid-Continent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on sales of assets | $ 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
Disposal group, disposed of by sale, not discontinued operations | Mid-Continent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received | $ 130 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, disposed of by sale, not discontinued operations | Utica shale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  |  | $ 1,868 |  |  |  |  |  |  |  |  | $ 1,868 |  |
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 |  |
Disposal group, disposed of by sale, not discontinued operations | Utica shale | Synthetic gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net rentable area (in acres) | a |  |  |  | 320,000 |  |  |  |  |  |  |  |  | 320,000 |  |
Disposal group, disposed of by sale, not discontinued operations | Utica shale | Future natural gas prices |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  |  |  |  |  |  | $ 100 |  |  |  | 100 |  | $ 100 |
Period of trading days | day |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |
Consecutive trading days | day |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 |
Disposal group, disposed of by sale, not discontinued operations | Utica shale | 2022 NYMEX natural gas | Future natural gas prices 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sales price (in usd per unit) | $ / BTU |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25 |
Disposal group, disposed of by sale, not discontinued operations | Utica shale | 2022 NYMEX natural gas | Future natural gas prices |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  |  |  |  |  |  | $ 50 |  |  |  | $ 50 |  | $ 50 |
Gain (loss) on sale of oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |  | $ (273) |  |
Disposal group, disposed of by sale, not discontinued operations | Utica shale | 2022 NYMEX natural gas | Future natural gas prices 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sales price (in usd per unit) | $ / BTU |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00 |

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