Condensed Consolidated Statements of Equity - USD ($) $ in Millions	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Retained Earnings	Non-Redeemable Non-Controlling Interests	Total
Balance at beginning of period at Dec. 31, 2019	$ 1	$ 1,137	$ (1,040)	$ (1,158)	$ 3,780	$ 21
Increase (Decrease) in Stockholders' Equity
Net income (loss)					75	3
Dividends declared					(42)
Share-based compensation, net of issuance		5	12
Other comprehensive income (loss)				(164)		(3)
Balance at end of period at Mar. 31, 2020	1	1,142	(1,028)	(1,322)	3,813	21
Balance at beginning of period at Dec. 31, 2020	1	1,150	(1,024)	(1,133)	3,957	21	$ 2,972
Increase (Decrease) in Stockholders' Equity
Net income (loss)					(246)	4
Dividends declared					(44)
Repurchases of common stock, net			(14)				(14)
Share-based compensation, net of issuance		5	16
Other comprehensive income (loss)				(31)		1
Balance at end of period at Mar. 31, 2021	$ 1	$ 1,155	$ (1,022)	$ (1,164)	$ 3,667	$ 26	$ 2,663