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Fair Value Measurements Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale investments $ 8 $ 9
Derivatives 86 178
Derivatives (79) (84)
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money market funds 3,783 4,534
Available-for-sale investments 8 9
Derivatives 86 178
Total assets 3,877 4,721
Derivatives (79) (84)
Total liabilities (79) (84)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Money market funds 3,783 4,534
Available-for-sale investments 6 6
Total assets 3,789 4,540
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives 86 178
Total assets 86 178
Derivatives (79) (84)
Total liabilities (79) (84)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale investments 2 3
Total assets $ 2 $ 3