Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Exchange traded equity securities			$ 1
Mutual funds	127	[1]	137	[1]
Money market funds	59	[2]	8	[2]
Interest rate swap derivatives	7	[3]
Total assets measured at fair value	193		146
State and local obligations (including non-U.S. locales)	19		68
Other sovereign government obligations and supranational agencies	80		185
Corporate and other debt	3		30
Money market funds	119		152
Total fiduciary assets measured at fair value	221		435
Contingent consideration liability	119	[4]	106	[4]
Senior Notes due 2014	257	[5]
Total liabilities measured at fair value	376		106
Identical Assets (Level 1) [Member]
Exchange traded equity securities			1
Mutual funds	127	[1]	137	[1]
Money market funds	59	[2]	8	[2]
Total assets measured at fair value	186		146
Money market funds	119		152
Total fiduciary assets measured at fair value	119		152
Observable Inputs (Level 2) [Member]
Interest rate swap derivatives	7	[3]
Total assets measured at fair value	7
State and local obligations (including non-U.S. locales)	19		68
Other sovereign government obligations and supranational agencies	80		185
Corporate and other debt	3		30
Total fiduciary assets measured at fair value	102		283
Senior Notes due 2014	257	[5]
Total liabilities measured at fair value	257
Unobservable Inputs (Level 3) [Member]
Contingent consideration liability	119	[4]	106	[4]
Total liabilities measured at fair value	$ 119		$ 106

[1] Included in other assets in the consolidated balance sheets.

[2] Included in cash and cash equivalents in the consolidated balance sheets.

[3] Included in other receivables in the consolidated balance sheets.

[4] Included in accounts payable and accrued liabilities and other liabilities in the consolidated balance sheets.

[5] Included in long term debt in the consolidated balance sheets.