Fair Value Measurements (Changes In Fair Value Of Level 3 Liabilities Representing Acquisition Related Contingent Consideration) (Details) (USD $) In Millions					9 Months Ended
	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2011 Contingent Consideration [Member]
Fair Value, Beginning of Period	$ 119	[1]	$ 106	[1]	$ 106	[1]
Additions					16	[1]
Payments					(6)	[1]
Revaluation Impact					3	[1]
Fair Value, End of Period	$ 119	[1]	$ 106	[1]	$ 119	[1]

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