Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 15, 2019	Aug. 08, 2019	Sep. 30, 2019	Dec. 31, 2018
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%