Investments in Unconsolidated Entities - Summarized Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments in Unconsolidated Entities
Current assets	$ 6,140	$ 3,668
Current liabilities	6,234	4,255
Noncurrent liabilities	9,567	10,506
Revenues	42,078	23,290	$ 33,669
Operating income	842	(2,383)	1,980
Equity Method Investment, Nonconsolidated Investee
Investments in Unconsolidated Entities
Current assets	509	580
Noncurrent assets	8,879	8,769
Current liabilities	366	343
Noncurrent liabilities	15	10
Revenues	1,320	1,360	1,469
Operating income	505	828	994
Net income	$ 506	$ 826	$ 995