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	5,233			5,211			5,211	22
Other comprehensive income/(loss), net of tax	252				254		254	(2)
Common stock issued (including share-based compensation impacts)	168		168				168
Treasury stock/other	(132)					(131)	(131)	(1)
Cash dividends declared	(1,999)			(1,988)			(1,988)	(11)
Total equity/(deficit), ending balance at Sep. 30, 2017	33,840	41	21,804	19,982	(6,759)	(1,253)	33,815	25
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	3,807			3,793			3,793	14
Other comprehensive income/(loss), net of tax	(471)				(470)		(470)	(1)
Common stock issued (including share-based compensation impacts)	168		168				168
Treasury stock/other	(164)					(164)	(164)
Dividends	(2,327)			(2,315)			(2,315)	(12)
Total equity/(deficit), ending balance at Sep. 30, 2018	$ 36,619	$ 41	$ 22,011	$ 23,384	$ (7,429)	$ (1,417)	$ 36,590	$ 29