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	7,024				7,036		(12)
Other comprehensive income, net of tax of ($133) in 2018 and ($255) in 2017	424					424
Share-based compensation and related dividend equivalents	150		167		(17)
Treasury shares issued for stock options exercised, net	70		(37)	107
Treasury shares issued for other share-based plans, net	(239)		(220)	(19)
Common shares repurchased	(8,415)			(8,415)
Dividends, Common Stock, Cash	(1,971)				(1,971)
Changes in noncontrolling interests	35						35
Balance at Sep. 30, 2018	(1,209)	5,061	6,714	(51,781)	54,666	(15,949)	80
Balance at Jun. 30, 2018	(1,374)	5,061	6,676	(49,342)	52,303	(16,139)	67
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	2,361				2,363		(2)
Other comprehensive income, net of tax of ($133) in 2018 and ($255) in 2017	190					190
Share-based compensation and related dividend equivalents	52		52
Treasury shares issued for stock options exercised, net	7		(5)	12
Treasury shares issued for other share-based plans, net	(10)		(9)	(1)
Common shares repurchased	(2,450)			(2,450)
Changes in noncontrolling interests	15						15
Balance at Sep. 30, 2018	(1,209)	5,061	6,714	(51,781)	54,666	(15,949)	80
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	352				374		(22)
Other comprehensive income, net of tax of ($133) in 2018 and ($255) in 2017	156					156
Share-based compensation and related dividend equivalents	160		176		(16)
Treasury shares issued for stock options exercised, net	40		(42)	82
Treasury shares issued for other share-based plans, net	(221)		(214)	(7)
Common shares repurchased	(2,651)			(2,651)
Dividends, Common Stock, Cash	(2,313)				(2,313)
Changes in noncontrolling interests	258						258
Balance at Sep. 30, 2019	(3,809)	5,061	6,688	(54,924)	53,986	(14,927)	307
Balance at Jun. 30, 2019	(4,943)	5,061	6,638	(54,932)	52,819	(14,908)	379
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,152				1,167		(15)
Other comprehensive income, net of tax of ($133) in 2018 and ($255) in 2017	(19)					(19)
Share-based compensation and related dividend equivalents	56		56
Treasury shares issued for stock options exercised, net	(3)		(3)
Treasury shares issued for other share-based plans, net	5		(3)	8
Changes in noncontrolling interests	(57)						(57)
Balance at Sep. 30, 2019	$ (3,809)	$ 5,061	$ 6,688	$ (54,924)	$ 53,986	$ (14,927)	$ 307