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Oil and Natural Gas Property Transactions - Narrative (Details) shares in Millions, $ in Millions |  | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 01, 2019 USD ($) shares | Mar. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) well | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) a well
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 2,386 |  | $ 2,289 | [1] |  | $ 4,582 | $ 4,813 | [1]
Proceeds from divestitures of proved and unproved properties |  |  |  |  |  |  |  | 82 | 384 | [2]
Mid-Continent |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from divestitures of proved and unproved properties |  |  |  |  |  |  |  |  | $ 491 |
Number of net acres | a |  |  |  |  |  |  |  |  | 238,500 |
Productive gas wells, number of wells, net | well |  |  |  |  | 3,200 |  |  |  | 3,200 |
Other properties |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from divestitures of proved and unproved properties |  |  | $ 56 | $ 5 |  |  |  | $ 82 | $ 23 |
Wildhorse Resource Development Corporation |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued in the merger (in shares) | shares | 717.4 |  |  |  |  |  |  |  |  |
Cash | $ 381 |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | $ 308 |  |  |
Operating expenses |  | $ 369 |  |  |  |  |  |  |  |
Other expenses |  | $ 54 |  |  |  |  |  |  |  |
[1] | Financial information for 2018 has been recast to reflect the retrospective application of the successful efforts method of accounting. See Note 1.
[2] | 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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