Consolidated Statements of Equity - 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, 2014		$ 561	$ 930	$ 10,335	$ (3,847)	$ (925)	$ 79
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(40)
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact			(53)			174
Net income	$ 495			482			13
Dividend equivalents declared – (per share amounts: $0.62 in 2016 and $0.56 in 2015)				(1)
Dividends declared – (per share amounts: $0.62 in 2016 and $0.56 in 2015)				(301)
Other comprehensive income (loss), net of tax	(243)				(243)
Purchase of treasury shares						(300)
Distributions							(1)
Balance, end of period at Mar. 31, 2015	6,863		837	10,515	(4,090)	(1,051)	91
Balance, beginning of year at Dec. 31, 2015	6,602	$ 561	861	11,302	(4,220)	(1,991)	89
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(36)
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact			(48)			169
Net income	490			481			9
Dividend equivalents declared – (per share amounts: $0.62 in 2016 and $0.56 in 2015)				(1)
Dividends declared – (per share amounts: $0.62 in 2016 and $0.56 in 2015)				(322)
Other comprehensive income (loss), net of tax	123				123
Purchase of treasury shares						(200)
Distributions							(6)
Balance, end of period at Mar. 31, 2016	$ 6,771		$ 777	$ 11,460	$ (4,097)	$ (2,022)	$ 92