Condensed Consolidated Statements Of Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Non-Controlling Interest [Member]
Balance at Dec. 31, 2017	$ 1,713	$ 5,061	$ 6,804	$ (43,454)	$ 49,618	$ (16,373)	$ 57
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	4,663				4,673		(10)
Other comprehensive income, net of tax of ($133) in 2018 and ($255) in 2017	234					234
Share-based compensation and related dividend equivalents	98		115		(17)
Treasury shares issued for stock options exercised, net	63		(32)	95
Treasury shares issued for other share-based plans, net	(229)		(211)	(18)
Common shares repurchased	(5,965)			(5,965)
Dividends, Common Stock, Cash	(1,971)				(1,971)
Changes in noncontrolling interests	20						20
Balance at Jun. 30, 2018	(1,374)	5,061	6,676	(49,342)	52,303	(16,139)	67
Balance at Mar. 31, 2018	1,298	5,061	6,624	(46,396)	52,095	(16,162)	76
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	2,187				2,196		(9)
Other comprehensive income, net of tax of ($133) in 2018 and ($255) in 2017	23					23
Share-based compensation and related dividend equivalents	53		70		(17)
Treasury shares issued for stock options exercised, net	13		(7)	20
Treasury shares issued for other share-based plans, net	(12)		(11)	(1)
Common shares repurchased	(2,965)			(2,965)
Dividends, Common Stock, Cash	(1,971)				(1,971)
Balance at Jun. 30, 2018	(1,374)	5,061	6,676	(49,342)	52,303	(16,139)	67
Balance at Dec. 31, 2018	410	5,061	6,768	(52,348)	55,941	(15,083)	71
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(800)				(793)		(7)
Other comprehensive income, net of tax of ($133) in 2018 and ($255) in 2017	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 Income (Loss), Including Portion Attributable to Noncontrolling Interest	(2,949)				(2,942)		(7)
Other comprehensive income, net of tax of ($133) in 2018 and ($255) in 2017	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