Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Shares [Member]	Non-Controlling Interests [Member]
Balance, beginning of year at Dec. 31, 2013		$ 561	$ 1,028	$ 9,452	$ (2,621)	$ (515)	$ 70
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(47)
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact			(67)			251
Net income	$ 894			874			20
Dividend equivalents declared – (per share amounts: $0.87 in 2015 and $0.78 in 2014)				(2)
Dividends declared – (per share amounts: $0.87 in 2015 and $0.78 in 2014)				(427)
Other comprehensive income (loss), net of tax	14				14
Purchase of treasury shares						(350)
Other changes							(13)
Balance, end of period at Jun. 30, 2014	8,228		914	9,897	(2,607)	(614)	77
Balance, beginning of year at Dec. 31, 2014	7,133	$ 561	930	10,335	(3,847)	(925)	79
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(19)
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact			(69)			235
Net income	924			901			23
Dividend equivalents declared – (per share amounts: $0.87 in 2015 and $0.78 in 2014)				(2)
Dividends declared – (per share amounts: $0.87 in 2015 and $0.78 in 2014)				(466)
Other comprehensive income (loss), net of tax	(76)				(76)
Purchase of treasury shares						(775)
Other changes							(13)
Balance, end of period at Jun. 30, 2015	$ 6,872		$ 842	$ 10,768	$ (3,923)	$ (1,465)	$ 89