SUPPLEMENTARY INFORMATION SUPPLEMENTAL CASH FLOW INFORMATION - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Interest, net of amounts capitalized	$ 41	$ 37	$ 37
Income taxes	$ 93	$ 136	$ 269