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	5,137				5,138		(1)
Other comprehensive income, net of tax of ($133) in 2018 and ($255) in 2017	587					587
Share-based compensation and related dividend equivalents	150		168		(18)
Treasury shares issued for stock options exercised, net	290		(80)	370
Treasury shares issued for other share-based plans, net	(114)		(178)	64
Defined Benefit Plan, Plan Assets, Contributions by Employer	3,500		2,082	1,418
Common shares repurchased	(7,500)			(7,500)
Dividends, Common Stock, Cash	(1,709)				(1,709)
Balance at Sep. 30, 2017	2,258	5,061	6,754	(41,745)	45,165	(13,036)	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	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