Goodwill And Other Intangibles (Changes In The Carrying Amount Of Goodwill) (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010
Goodwill And Other Intangibles [Abstract]
Balance as of January 1, as reported	$ 6,420	[1]	$ 5,990	[1]
Goodwill acquired	88		349
Other adjustments	31	[2]	(53)	[2]
Balance at September 30	$ 6,539		$ 6,286

[1] Amounts in 2010 exclude goodwill and accumulated impairment losses related to Kroll, which were reclassified to discontinued operations.

[2] Primarily foreign exchange.