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	2,455			2,452			2,452	3
Other comprehensive income/(loss), net of tax	210				211		211	(1)
Common stock issued (including share-based compensation impacts)	33		33				33
Treasury stock/other	(146)					(145)	(145)	(1)
Cash dividends declared	(1,588)			(1,588)			(1,588)
Total equity/(deficit), ending balance at Mar. 31, 2016	29,621	41	21,454	15,278	(6,046)	(1,122)	29,605	16
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	1,594			1,587			1,587	7
Other comprehensive income/(loss), net of tax	82				84		84	(2)
Common stock issued (including share-based compensation impacts)	1		1				1
Cash dividends declared	(795)			(795)			(795)
Total equity/(deficit), ending balance at Mar. 31, 2017	30,641	$ 41	21,637	16,992	$ (6,929)	$ (1,122)	30,619	$ 22
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of accounting standards (Note 2)	$ 572		$ 6	$ 566			$ 572