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, 2015	$ 28,657	$ 41	$ 21,421	$ 14,414	$ (6,257)	$ (977)	$ 28,642	$ 15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,388			5,379			5,379	9
Other comprehensive income/(loss), net of tax	209				211		211	(2)
Common stock issued (including share-based compensation impacts)	177		177				177
Treasury stock/other	(147)					(145)	(145)	(2)
Cash dividends declared	(2,785)			(2,780)			(2,780)	(5)
Total equity/(deficit), ending balance at Sep. 30, 2016	31,499	41	21,598	17,013	(6,046)	(1,122)	31,484	15
Total equity/(deficit), beginning balance at Dec. 31, 2016	29,187	41	21,630	15,634	(7,013)	(1,122)	29,170	17
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,215			5,193			5,193	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	33,263	$ 41	21,804	19,405	$ (6,759)	$ (1,253)	33,238	$ 25
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of accounting standards (Note 2)	$ 572		$ 6	$ 566			$ 572