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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money Market Funds $ 465 [1] $ 563 [1]
Net derivative contracts (25) (14)
Available for sale investments 18 10
Total Cost Basis
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money Market Funds 465 [1] 563 [1]
Net derivative contracts 0 0
Available for sale investments 8 7
Quoted Prices In Active Markets for Identical Assets (Level 1)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money Market Funds 465 [1] 563 [1]
Net derivative contracts 0 0
Available for sale investments 18 10
Significant Other Observable Inputs (Level 2)
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money Market Funds 0 [1] 0 [1]
Net derivative contracts (25) (14)
Available for sale investments $ 0 $ 0
[1] Money market funds are comprised primarily of government obligations and other first tier obligations.