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Business Segment and Geographic Information (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Division
Countries
Customers
Dec. 31, 2016
USD ($)
Countries
Customers
Concentration Risk [Line Items]        
Number of business segments | Division     2  
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%
Number of Countries Exceed Receivables Threshold | Countries     1 2
Number of Customers Exceed Receivables Threshold | Customers     0 0
Venezuela trade receivables exchanged for promissory note $ 375 $ 200    
Pre-tax loss on promissory note $ 262 148    
Promissory note fair value   $ 52 $ 116 $ 70
VENEZUELA        
Concentration Risk [Line Items]        
Collections on receivables     600  
Accounts Receivable, Gross     429 $ 610
Accounts Receivable, Gross, Noncurrent     $ 267  
Accounts Receivable [Member] | VENEZUELA        
Concentration Risk [Line Items]        
Concentration Risk, Percentage     9.00% 15.00%
Geographic Concentration Risk [Member] | UNITED STATES | Accounts Receivable [Member]        
Concentration Risk [Line Items]        
Concentration Risk, Percentage     43.00% 28.00%