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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | Oct. 15, 2019 | Aug. 08, 2019 | Sep. 30, 2019 | Dec. 31, 2018
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Class of Stock [Line Items] |  |  |  |
Preferred stock, authorized shares (in shares) |  |  | 50,000,000 |
Preferred stock, par value (in dollars per share) |  |  | $ 1.00 | $ 1.00
Preferred stock, issued (in shares) |  |  | 100,000 |
Preferred stock, outstanding (in shares) |  |  | 100,000 | 0
Series A Preferred Stock | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Payments of preferred stock dividends | $ 149 |  |  |
Anadarko | Series A Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issued as part of the Merger (in shares) |  | 100,000 |  |
Face value (in usd per share) |  | $ 100,000 |  |
Preferred stock accrual rate per annum |  | 8.00% |  |
Preferred stock accrual rate per annum on unpaid amounts |  | 9.00% |  |

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