Quarterly report pursuant to Section 13 or 15(d)

Hedging Transactions And Derivative Financial Instruments (Narrative) (Details)

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Hedging Transactions And Derivative Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Foreign Currency Forward Contracts [Member]
Dec. 31, 2011
Foreign Currency Forward Contracts [Member]
Hedging Transactions And Derivative Financial Instruments [Line Items]      
Notional value of outstanding foreign currency forward contracts   $ 144 $ 141
Net gain position on outstanding currency contracts $ 1    
Derivative contract maturity date 12 months