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Equity - Common Stock (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 14, 2020 | Apr. 13, 2020 | Sep. 30, 2020 USD ($) shares | Jun. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Common stock, shares issued, beginning balance (shares) |  |  | 9,780,000 |  | 8,172,000 | 9,772,793 | 4,568,000
Restricted stock issuances (net of forfeitures and cancellations) (shares) |  |  | 0 |  | 2,000 | 7,000 | 19,000
Common stock, shares issued, ending balance (shares) |  |  | 9,780,371 | 9,780,000 | 9,771,000 | 9,780,371 | 9,771,000
Loss on exchange of preferred stock | $ |  |  | $ 0 | $ 17 | $ 17 | $ 0 | $ 17
COMMON STOCK |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock split, conversion ratio | 0.005 | 0.005 |  |  |  |  |
PREFERRED STOCK |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued, exchanged (in shares) |  |  | 0 |  | 40,000 | 0 | 40,000
PREFERRED STOCK | 5.75% (A) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued, exchanged (in shares) |  |  |  | 40,000 |  |  |
Interest rate, stated percentage |  |  |  | 5.75% |  |  |
Exchange of convertible notes for shares of common stock | COMMON STOCK |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued, exchanged (in shares) |  |  | 0 |  | 367,000 | 0 | 367,000
Exchange of senior notes for shares of common stock | COMMON STOCK |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued, exchanged (in shares) |  |  | 0 |  | 1,178,000 | 0 | 1,178,000
Exchange of preferred stock for shares of common stock | COMMON STOCK |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued, exchanged (in shares) |  |  | 0 | 51,839 | 52,000 | 0 | 52,000
Wildhorse Resource Development Corporation |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Common shares issued for WildHorse Merger (shares) |  |  | 0 |  | 0 | 0 | 3,587,000

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