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Fair Value of Financial Instruments (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Debt_Instruments
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Debt_Instruments
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number Of Debt Instruments With Related Interest Rate Swaps | Debt_Instruments 3   3    
Derivative, Notional Amount $ 1,500   $ 1,500    
Assets          
Fair value of investments and fixed income securities $ 101   101   $ 96
Investment maturity range (current) 1 year        
Available-for-sale Securities, Debt Maturities, Date May 01, 2019        
Venezuela trade receivables exchanged for promissory note $ 200   200    
Pre-tax loss on promissory note 148 $ 0 148 $ 0  
Promissory note fair value 52   52    
Other Current Assets          
Assets          
Available-for-sale Securities, Current 63   63   63
Other Assets          
Assets          
Available-for-sale Securities, Noncurrent 38   38   33
Long-term debt          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term Debt, Fair Value 14,476   14,476   15,956
Carrying value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term Debt 12,921   12,921   15,346
Level 1          
Assets          
Fair value of investments and fixed income securities 0   0   0
Level 1 | Long-term debt          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term Debt, Fair Value 1,402   1,402   1,009
Level 2 | Long-term debt          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term Debt, Fair Value 13,074   13,074   14,947
Level 3          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term Debt, Fair Value 0   0   0
Assets          
Fair value of investments and fixed income securities $ 0   $ 0   $ 0