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, 2016	$ 1,917	$ 5,061	$ 4,762	$ (36,097)	$ 41,754	$ (13,623)	$ 60
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	3,327				3,328		(1)
Other comprehensive income, net of tax of ($50) in 2018 and ($94) in 2017	389					389
Share-based compensation and related dividend equivalents	99		116		(17)
Treasury shares issued for stock options exercised, net	241		(63)	304
Treasury shares issued for other share-based plans, net	(108)		(171)	63
Common shares repurchased	(5,000)			(5,000)
Dividends, Common Stock, Cash	(1,687)				(1,687)
Balance at Jun. 30, 2017	(822)	5,061	4,644	(40,730)	43,378	(13,234)	59
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 ($50) in 2018 and ($94) 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