Fair Value Measurements (Changes In Fair Value Of Level 3 Liabilities Representing Acquisition Related Contingent Consideration) (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2012 Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Beginning of Period	$ 108	[1]	$ 110	[1]	$ 110
Additions					10
Payments					(13)
Revaluation Impact					1
Fair Value, End of Period	$ 108	[1]	$ 110	[1]	$ 108

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