Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Significant transactions with related parties
Operating revenues and other income	$ 88	$ 79	$ 89
Purchases	5	0	38
Operating expenses and selling, general and administrative expenses	196	63	65
Net interest income	$ (2)	$ (5)	$ (13)