Consolidated Statements Of Equity (USD $) In Millions, unless otherwise specified	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, 2011		$ 561	$ 1,156	$ 7,949	$ (3,188)	$ (595)	$ 57
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(45)
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact			(36)			282
Purchase of subsidiary shares from non-controlling interests			1
Net income	938			917			21
Distributions	5						(5)
Dividend equivalents declared (per share amounts: $0.96 in 2013 and $0.90 in 2012)				(6)
Dividends declared – (per share amounts: $0.96 in 2013 and $0.90 in 2012)				(489)
Other comprehensive income, net of tax	183				183
Purchase of treasury shares						(180)
Other changes							(3)
Balance, end of period at Sep. 30, 2012	6,580	561	1,076	8,371	(3,005)	(493)	70
Balance, beginning of year at Dec. 31, 2012	6,606	561	1,107	8,628	(3,307)	(447)	64
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accrued stock compensation costs			(45)
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact			(52)			380
Purchase of subsidiary shares from non-controlling interests			0
Net income	1,078			1,054			24
Distributions	17						(17)
Dividend equivalents declared (per share amounts: $0.96 in 2013 and $0.90 in 2012)				(5)
Dividends declared – (per share amounts: $0.96 in 2013 and $0.90 in 2012)				(526)
Other comprehensive income, net of tax	94				94
Purchase of treasury shares						(400)
Other changes							7
Balance, end of period at Sep. 30, 2013	$ 7,120	$ 561	$ 1,010	$ 9,151	$ (3,213)	$ (467)	$ 78