CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Millions	Total	Capital Stock [Member]	Capital in Excess of Par Value of Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Parent [Member]	Equity Attributable to Non-controlling Interests [Member]
Total equity/(deficit), beginning balance at Dec. 31, 2016	$ 29,746	$ 41	$ 21,630	$ 16,193	$ (7,013)	$ (1,122)	$ 29,729	$ 17
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,654			3,639			3,639	15
Other comprehensive income/(loss), net of tax	295				297		297	(2)
Common stock issued (including share-based compensation impacts)	99		99				99
Treasury stock/other	(132)					(131)	(131)	(1)
Cash dividends declared	(1,403)			(1,392)			(1,392)	(11)
Total equity/(deficit), ending balance at Jun. 30, 2017	32,831	41	21,735	19,006	(6,716)	(1,253)	32,813	18
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of accounting standards	572		6	566			572
Total equity/(deficit), beginning balance at Dec. 31, 2017	35,606	41	21,843	21,906	(6,959)	(1,253)	35,578	28
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,814			2,802			2,802	12
Other comprehensive income/(loss), net of tax	(245)				(245)		(245)
Common stock issued (including share-based compensation impacts)	110		110				110
Treasury stock/other	(89)					(89)	(89)
Dividends	(1,727)			(1,715)			(1,715)	(12)
Total equity/(deficit), ending balance at Jun. 30, 2018	$ 36,469	$ 41	$ 21,953	$ 22,993	$ (7,204)	$ (1,342)	$ 36,441	$ 28