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Fair Value of Financial Instruments (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Debt_Instruments
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Debt_Instruments
Sep. 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 $ 96     96   $ 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        
Pre-tax loss on promissory note   $ 148 $ 0 148 $ 0  
Promissory note fair value $ 60     60    
Promissory note fair value, current 14     14    
Promissory note fair value, noncurrent 46     46    
Other Current Assets            
Assets            
Available-for-sale Securities, Current 60     60   63
Other Assets            
Assets            
Available-for-sale Securities, Noncurrent 36     36   33
Long-term debt            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Long-term Debt, Fair Value 13,726     13,726   15,956
Carrying value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Long-term Debt 12,315     12,315   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 783     783   1,009
Level 2 | Long-term debt            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Long-term Debt, Fair Value 12,943     12,943   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