Fair Value Measurements (Changes In Fair Value Of Level 3 Liabilities Representing Acquisition Related Contingent Consideration) (Details) (USD $) In Millions, unless otherwise specified					6 Months Ended
	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2012 Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Beginning of Period	$ 116	[1]	$ 110	[1]	$ 110
Additions					18
Payments					(14)
Revaluation Impact					2
Fair Value, End of Period	$ 116	[1]	$ 110	[1]	$ 116

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