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	4,427			4,422			4,422	5
Other comprehensive income/(loss), net of tax	280				281		281	(1)
Common stock issued (including share-based compensation impacts)	125		125				125
Treasury stock/other	(146)					(145)	(145)	(1)
Cash dividends declared	(2,189)			(2,184)			(2,184)	(5)
Total equity/(deficit), ending balance at Jun. 30, 2016	31,154	41	21,546	16,652	(5,976)	(1,122)	31,141	13
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	3,644			3,629			3,629	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	32,262	$ 41	21,735	18,437	$ (6,716)	$ (1,253)	32,244	$ 18
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of accounting standards (Note 2)	$ 572		$ 6	$ 566			$ 572