Equity method Investments - Equity Investments in Affiliates Balance Affected (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	$ 352	$ 417	$ 373
Mattox
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	60	45	0
Amberjack
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	106	102	125
Mars
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	83	114	126
Bengal
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	9	18	24
Explorer
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	61	44	41
Colonial
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	18	75	40
Poseidon
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	0	0	0
Other
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	$ 15	$ 19	$ 17