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Risk Management (Summary of Fair Values and Location in Condensed Consolidated Balance Sheet) (Details) - Not Designated As Hedging Instruments - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets $ 9 $ 6
Fair value of derivative liabilities 32 3
Foreign exchange contracts | Other assets    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 9 6
Foreign exchange contracts | Accrued liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities $ 32 2
Interest rate swap | Other assets    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets   0
Interest rate swap | Accrued liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities   $ 1