Hedging Transactions And Derivative Financial Instruments (Schedule Of Fair Value Assets And Liabilities Relating To Foreign Currency Forward Contracts) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Hedging Transactions And Derivative Financial Instruments [Line Items]
Contracts designated as cash flow hedging instruments	$ (1)
Cash Flow Hedging [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]
Contracts designated as cash flow hedging instruments	0	0
Cash Flow Hedges [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]
Contracts designated as cash flow hedging instruments	$ 1	$ 2