Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Net income (loss) attributable to redeemable noncontrolling interest	$ 3	$ 2	$ 4
Cash dividends declared (USD per share)	$ 3.40	$ 3.28	$ 3.00