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	1,579				1,579
Other comprehensive income, net of tax of ($50) in 2018 and ($94) in 2017	208					208
Share-based compensation and related dividend equivalents	48		48
Treasury shares issued for stock options exercised, net	173		(42)	215
Treasury shares issued for other share-based plans, net	(102)		(164)	62
Common shares repurchased	(2,500)			(2,500)
Balance at Mar. 31, 2017	1,323	5,061	4,604	(38,320)	43,333	(13,415)	60
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	2,476				2,477		(1)
Other comprehensive income, net of tax of ($50) in 2018 and ($94) in 2017	211					211
Share-based compensation and related dividend equivalents	45		45
Treasury shares issued for stock options exercised, net	50		(25)	75
Treasury shares issued for other share-based plans, net	(217)		(200)	(17)
Common shares repurchased	(3,000)			(3,000)
Changes in noncontrolling interests	20						20
Balance at Mar. 31, 2018	$ 1,298	$ 5,061	$ 6,624	$ (46,396)	$ 52,095	$ (16,162)	$ 76