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Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds $ 7 $ 13
Net derivative contracts (66) (42)
Available for sale investments 26 25
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 7 13
Net derivative contracts 0 0
Available for sale investments 26 25
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0 0
Net derivative contracts (66) (42)
Available for sale investments 0 0
Total Cost Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 7 13
Net derivative contracts 0 0
Available for sale investments $ 12 $ 11