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Risk Management (Summary Of Fair Values And Location In Condensed Consolidated Balance Sheet) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets $ 1 $ 1
Fair value of derivative liabilities 7 8
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 0 0
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 1 2
Not Designated As Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 1 1
Fair value of derivative liabilities 6 6
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 1 1
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 2 3
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 0 0
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities $ 4 $ 3