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Risk Management (Narrative) (Details) (USD $)
Sep. 28, 2013
position
Dec. 31, 2012
position
Derivative [Line Items]    
Notional amount of foreign currency derivatives $ 762,000,000 $ 523,000,000
Number of net notional positions to buy or sell foreign currency disclosed (in number of positions) 5 5
Fair value of derivative liabilities 4,000,000 7,000,000
Aggregate credit risk with all counterparties 5,000,000  
Interest Rate Contracts [Member]
   
Derivative [Line Items]    
Principal amount outstanding 2,500,000,000  
Not Designated As Hedging Instruments [Member]
   
Derivative [Line Items]    
Fair value of derivative liabilities 3,000,000 7,000,000
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member] | Other Liabilities [Member]
   
Derivative [Line Items]    
Fair value of derivative liabilities $ 3,000,000 $ 4,000,000