CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Loss	Stockholders' Equity Attributable to Parent	Noncontrolling Interest
Beginning balance at Dec. 31, 2019	$ 4,996	$ 447	$ (590)	$ 8,430	$ (2,404)	$ (920)	$ 4,963	$ 33
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(1,414)				(1,279)	(130)	(1,409)	(5)
Dividends declared on common stock	(97)			(97)			(97)
Equity compensation, net of tax	2	1	(6)	7			2
Other changes attributable to noncontrolling interests	(5)					(5)	(5)
Distributions to noncontrolling interests	(3)							(3)
Ending balance at Mar. 31, 2020	3,479	448	(596)	8,340	(3,683)	(1,055)	3,454	25
Beginning balance at Dec. 31, 2020	3,900	448	(598)	8,078	(3,174)	(880)	3,874	26
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	55				89	(32)	57	(2)
Dividends declared on common stock	(101)			(101)			(101)
Equity compensation, net of tax	8	2	(10)	16			8
Other changes attributable to noncontrolling interests	(1)					(2)	(2)	1
Ending balance at Mar. 31, 2021	$ 3,861	$ 450	$ (608)	$ 7,993	$ (3,085)	$ (914)	$ 3,836	$ 25