Hedging Transactions And Derivative Financial Instruments (Schedule Of Fair Value Assets And Liabilities Relating To Foreign Currency Forward Contracts) (Details) (Contracts Designated As Cash Flow Hedging Instruments [Member], Foreign Currency Forward Contracts [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Contracts Designated As Cash Flow Hedging Instruments [Member] | Foreign Currency Forward Contracts [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]
Contracts designated as cash flow hedging instruments	$ 1	$ (2)