Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]
Beginning balance at Dec. 31, 2018	$ 6,745	$ 1	$ (3,727)	$ 6,680	$ (40)	$ 2,770	$ 1,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	744					582	162
Currency translation adjustment	5				8		(3)
Exercise of stock options	14			12			2
Stock-based compensation	9			8			1
Repurchase of common stock	(174)		(174)
Dividends declared and noncontrolling interest payments	(903)					(595)	(308)
Ending balance at Mar. 31, 2019	6,440	1	(3,901)	6,700	(32)	2,757	915
Beginning balance at Dec. 31, 2019	6,507	1	(4,481)	6,569	(3)	3,101	1,320
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(51)					(1)	(50)
Currency translation adjustment	(111)				(116)		5
Exercise of stock options	16			16
Stock-based compensation	7			6			1
Dividends declared and noncontrolling interest payments	(911)					(603)	(308)
Ending balance at Mar. 31, 2020	$ 5,457	$ 1	$ (4,481)	$ 6,591	$ (119)	$ 2,497	$ 968