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, 2018		1,579				130
Balance at Dec. 31, 2018	$ 17,892	$ 158	$ 26,013	$ (12,041)	$ (605)	$ (3,727)	$ 9,798	$ 8,094
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards (in shares)	3					1
Exercised and issued stock-based awards	$ 1		1				1
Stock-based compensation, including the tender of shares	26		33			$ (7)	26	0
Contributions from noncontrolling interest	100		49				49	51
Dividends	(216)		(146)				(146)	(70)
Noncontrolling Interest, Period Increase (Decrease)	(12)		(1)				(1)	(11)
Net loss attributable to common stockholders	(41)			(41)			(41)
Net income (loss) attributable to noncontrolling interests	43							43
Other comprehensive income	24				23		23	1
Balance (in shares) at Jun. 30, 2019		1,582				131
Balance at Jun. 30, 2019	17,817	$ 158	25,949	(12,082)	(582)	$ (3,734)	9,709	8,108
Balance (in shares) at Mar. 31, 2019		1,582				131
Balance at Mar. 31, 2019	17,841	$ 158	25,963	(12,010)	(594)	$ (3,734)	9,783	8,058
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards (in shares)						0
Stock-based compensation, including the tender of shares	10		10			$ 0	10
Contributions from noncontrolling interest	100		49				49	51
Dividends	(73)		(73)				(73)	0
Net loss attributable to common stockholders	(72)			(72)			(72)
Net income (loss) attributable to noncontrolling interests	(2)							(2)
Other comprehensive income	13				12		12	1
Balance (in shares) at Jun. 30, 2019		1,582				131
Balance at Jun. 30, 2019	17,817	$ 158	25,949	(12,082)	(582)	$ (3,734)	9,709	8,108
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 interest	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			$ 0	9	1
Contributions from noncontrolling interest	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