Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Included in operating activities:
Interest paid	$ 54	$ 53
Income taxes paid to (received from) taxing authorities, net of refunds	12	2
Noncash investing activities:
Increase in asset retirement costs	7	6
Capital expenditures incurred but not yet paid	$ 96	$ 69