Condensed Consolidated Statements Of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Non-Controlling Interest	Less: Noncontrolling Interest not presented on Income Statement [Member]
Balance at Dec. 31, 2018	$ 410	$ 5,061	$ 6,768	$ (52,348)	$ 55,941	$ (15,083)	$ 71
Net loss	(793)						(7)	$ (800)
Net Income (Loss) Attributable to Parent	(793)				(793)
Other comprehensive income, net of tax	175					175
Share-based compensation and related dividend equivalents	104		120		(16)
Treasury shares issued for stock options exercised, net	(43)		(39)	(82)
Treasury shares issued for other share-based plans, net	(226)		(211)	(15)
Common shares repurchased	(2,651)			(2,651)
Dividends, Common Stock, Cash	(2,313)				(2,313)
Changes in noncontrolling interests	315						315
Balance at Jun. 30, 2019	(4,943)	5,061	6,638	(54,932)	52,819	(14,908)	379
Balance at Mar. 31, 2019	232	5,061	6,573	(54,630)	58,090	(14,969)	107
Net loss	(2,942)						(7)	$ (2,949)
Net Income (Loss) Attributable to Parent	(2,942)				(2,942)
Other comprehensive income, net of tax	61					61
Share-based compensation and related dividend equivalents	57		73		(16)
Treasury shares issued for stock options exercised, net	(2)		(3)	(5)
Treasury shares issued for other share-based plans, net	(2)		(5)	3
Common shares repurchased	(310)			(310)
Dividends, Common Stock, Cash	(2,313)				(2,313)
Changes in noncontrolling interests	279						279
Balance at Jun. 30, 2019	(4,943)	5,061	6,638	(54,932)	52,819	(14,908)	379
Balance at Dec. 31, 2019	(8,300)	5,061	6,745	(54,914)	50,644	(16,153)	317
Net loss	(3,036)						(32)
Net Income (Loss) Attributable to Parent	(3,004)				(3,004)
Other comprehensive income, net of tax	128					128
Share-based compensation and related dividend equivalents	115		115
Treasury shares issued for stock options exercised, net	(27)		(20)	(47)
Treasury shares issued for other share-based plans, net	(154)		(192)	38
Balance at Jun. 30, 2020	(11,382)	5,061	6,648	(54,829)	47,478	(16,025)	285
Balance at Mar. 31, 2020	(9,360)	5,061	6,595	(54,842)	49,854	(16,333)	305
Net loss	(2,395)						(19)
Net Income (Loss) Attributable to Parent	(2,376)				(2,376)
Other comprehensive income, net of tax	308					308
Share-based compensation and related dividend equivalents	60		60
Treasury shares issued for stock options exercised, net	(7)		(4)	(11)
Treasury shares issued for other share-based plans, net	(1)		(3)	2
Changes in noncontrolling interests	(1)						(1)
Balance at Jun. 30, 2020	$ (11,382)	$ 5,061	$ 6,648	$ (54,829)	$ 47,478	$ (16,025)	$ 285