Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Shares	Non-Controlling Interests
Balance, beginning of year at Dec. 31, 2016		$ 561	$ 842	$ 12,388	$ (5,093)	$ (2,506)	$ 80
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(10)
Issuance of shares under stock compensation plans and employee stock purchase plans			(69)			201
Cumulative effect of adoption of new revenue recognition standard and other new accounting standards				0	0
Cumulative effect of adoption of new revenue recognition standard and other new accounting standards | Accounting Standards Update 2014-09				0
Net income	$ 1,085			1,070			15
Dividend equivalents declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)				(2)
Dividends declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)				(541)
Other comprehensive income, net of tax	552				552
Purchase of treasury shares						(400)
Distributions and other changes							(14)
Balance, end of period at Jun. 30, 2017	7,074		763	12,915	(4,541)	(2,705)	81
Balance, beginning of year at Dec. 31, 2017	7,442	$ 561	784	13,140	(4,043)	(3,083)	83
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(26)
Issuance of shares under stock compensation plans and employee stock purchase plans			(26)			140
Cumulative effect of adoption of new revenue recognition standard and other new accounting standards				0	(14)
Cumulative effect of adoption of new revenue recognition standard and other new accounting standards | Accounting Standards Update 2014-09				364
Net income	1,232			1,221			11
Net income | Accounting Standards Update 2014-09	1,232
Dividend equivalents declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)				(3)
Dividends declared – (per share amounts: $1.165 in 2018 and $1.06 in 2017)				(591)
Other comprehensive income, net of tax	(208)				(208)
Purchase of treasury shares						(500)
Distributions and other changes							(13)
Balance, end of period at Jun. 30, 2018	7,797		$ 732	$ 14,131	$ (4,265)	$ (3,443)	$ 81
Balance, end of period (Accounting Standards Update 2014-09) at Jun. 30, 2018	$ 7,797