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Receivables (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Countries
Customers
Dec. 31, 2015
USD ($)
Countries
Customers
Dec. 31, 2014
USD ($)
Jun. 30, 2016
USD ($)
Concentration Risk [Line Items]        
Venezuela trade receivables exchanged for promissory note $ 200     $ 200
Maximum Percentage Gross Trade Receivables From One Geographic Segment 10.00% 10.00%    
Maximum Percentage Gross Trade Receivables From One Customer 10.00% 10.00%    
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Balance at Beginning of Period $ 145 $ 137 $ 117  
Charged to Costs and Expenses 50 44 26  
Write-Offs (20) (36) (6)  
Balance at End of Period $ 175 $ 145 $ 137  
NumberOfCountriesExceedReceivablesThreshold | Countries 2 2    
NumberOfCustomersExceedReceivablesThreshold | Customers 0 0    
Geographic Concentration Risk | UNITED STATES | Accounts Receivable        
Concentration Risk [Line Items]        
Concentration Risk, Percentage (in hundredths) 28.00% 26.00%    
VENEZUELA        
Concentration Risk [Line Items]        
Accounts Receivable, Gross $ 610 $ 704    
Accounts Receivable, Gross, Noncurrent $ 409      
VENEZUELA | Accounts Receivable        
Concentration Risk [Line Items]        
Concentration Risk, Percentage (in hundredths) 15.00% 14.00%