Consolidated Statement of Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Accumulated Deficit	AOCI Attributable to Parent [Member]	Common Stock Held in Treasury	Total Stockholder's Equity	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2019		1,582				131
Balance at Dec. 31, 2019	$ 17,448	$ 158	$ 25,830	$ (12,280)	$ (676)	$ (3,734)	$ 9,298	$ 8,150
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards (in shares)	1
Exercised and issued stock-based awards	$ 1		1				1
Stock-based compensation, including the tender of shares	34		38			$ (5)	33	1
Contributions from noncontrolling interests	74		36				36	38
Net loss attributable to common stockholders	(438)			(438)			(438)
Net income (loss) attributable to noncontrolling interests	13							13
Other comprehensive income	23				24		24	(1)
Balance (in shares) at Jun. 30, 2020		1,583				131
Balance at Jun. 30, 2020	17,155	$ 158	25,905	(12,718)	(652)	$ (3,739)	8,954	8,201
Balance (in shares) at Mar. 31, 2020		1,583				131
Balance at Mar. 31, 2020	16,963	$ 158	25,875	(12,771)	(668)	$ (3,739)	8,855	8,108
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation, including the tender of shares	10		9				9	1
Contributions from noncontrolling interests	42		21				21	21
Net loss attributable to common stockholders	53			53			53
Net income (loss) attributable to noncontrolling interests	71							71
Other comprehensive income	16				16		16	0
Balance (in shares) at Jun. 30, 2020		1,583				131
Balance at Jun. 30, 2020	17,155	$ 158	25,905	(12,718)	(652)	$ (3,739)	8,954	8,201
Balance (in shares) at Dec. 31, 2020		1,590				132
Balance at Dec. 31, 2020	$ 18,668	$ 159	26,037	(11,681)	(583)	$ (3,758)	10,174	8,494
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards (in shares)	11
Exercised and issued stock-based awards	$ 184	$ 1	183				184
Stock-based compensation, including the tender of shares (in shares)						1
Stock-based compensation, including the tender of shares	20		43			$ (19)	24	(4)
Contributions from noncontrolling interests	88		43				43	45
Dividends	(315)		(222)				(222)	(93)
Net loss attributable to common stockholders	1,801			1,801			1,801
Net income (loss) attributable to noncontrolling interests	483							483
Other comprehensive income	6				7		7	(1)
Balance (in shares) at Jun. 30, 2021		1,601				133
Balance at Jun. 30, 2021	20,935	$ 160	26,084	(9,880)	(576)	$ (3,777)	12,011	8,924
Balance (in shares) at Mar. 31, 2021		1,597				133
Balance at Mar. 31, 2021	$ 19,573	$ 160	26,080	(10,963)	(580)	$ (3,777)	10,920	8,653
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards (in shares)	4
Exercised and issued stock-based awards	$ 78		78				78
Stock-based compensation, including the tender of shares	13		14				14	(1)
Contributions from noncontrolling interests	47		23				23	24
Dividends	(111)		(111)				(111)
Net loss attributable to common stockholders	1,083			1,083			1,083
Net income (loss) attributable to noncontrolling interests	248							248
Other comprehensive income	4				4		4	0
Balance (in shares) at Jun. 30, 2021		1,601				133
Balance at Jun. 30, 2021	$ 20,935	$ 160	$ 26,084	$ (9,880)	$ (576)	$ (3,777)	$ 12,011	$ 8,924