Fair Value Measurements (Changes In Fair Value Of Level 3 Liabilities Representing Acquisition Related Contingent Consideration) (Details) (USD $) In Millions, unless otherwise specified					12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2011 Contingent Consideration [Member]
Fair Value, Beginning of Period	$ 110	[1]	$ 106	[1]	$ 106	[1]
Additions					14	[1]
Payments					(13)	[1]
Revaluation Impact					3	[1]
Fair Value, End of Period	$ 110	[1]	$ 106	[1]	$ 110	[1]

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