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Financial Instruments - Fair Value Hedges (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Senior Notes due 2021    
Derivative [Line Items]    
Derivative Liability, Notional Amount $ 300 $ 300
Derivative Liability, Fair Value, Gross Asset $ 7 $ 5
Debt Instrument, Interest Rate, Effective Percentage 4.50%  
Senior Notes Due 2021 4.5% [Member] [Member]    
Derivative [Line Items]    
Debt, Weighted Average Interest Rate 2.46%