Stockholders' Equity (Components Of Stockholders' Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Redeemable Preferred and Common Securities of Subsidiaries	$ 549		$ 549		$ 549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2012			5,287
Net Income	547	518	1,098	1,005
Temporary Equity, Net Income			16
Unrealized currency translation adjustments	(423)	(269)	(591)	(8)
Employee postretirement benefits	36	(8)	89	8
Other	11	12	28	0
Comprehensive Income	171	253	624	1,005
Recognition of stock-based compensation			(52)	(43)
Temporary Equity, Other Changes			(2)
Balance at June 30, 2013	4,660		4,660
Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2012			4,985
Net Income			1,057
Unrealized currency translation adjustments			(576)	(11)
Employee postretirement benefits			88
Other			28	0
Stock-based awards exercised or vested			145
Recognition of stock-based compensation			52
Income tax benefits on stock-based compensation			27
Shares repurchased			(812)
Dividends declared			(625)
Other			4
Return of redeemable securities of subsidiaries			0
Balance at June 30, 2013	4,373		4,373
Noncontrolling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2012			302
Net Income			25
Unrealized currency translation adjustments			(15)
Employee postretirement benefits			1
Other			0
Stock-based awards exercised or vested			0
Recognition of stock-based compensation			0
Income tax benefits on stock-based compensation			0
Shares repurchased			0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			(24)
Other			(2)
Return of redeemable securities of subsidiaries			0
Balance at June 30, 2013	287		287
Redeemable Securities Of Subsidiaries [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Return			$ (14)