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Business Segment and Geographic Information (Narrative) (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Division
Countries
Customers
Mar. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Division
Countries
Customers
Jun. 30, 2017
USD ($)
Dec. 31, 2017
Countries
Customers
Concentration Risk [Line Items]            
Number of business segments | Division 2     2    
Impairments and other charges [1] $ 0   $ 262 $ 265 $ 262  
Gain (Loss) on Extinguishment of Debt         104  
Early Repayment of Senior Debt         1,400  
Maximum Percentage Gross Trade Receivables From One Geographic Segment 10.00%     10.00%   10.00%
Maximum Percentage Gross Trade Receivables From One Customer 10.00%     10.00%   10.00%
Number of Countries Exceed Receivables Threshold | Countries 1     1   1
Number of Customers Exceed Receivables Threshold | Customers 0     0   0
Foreign Currency Exchange Rate, Remeasurement 115,000 50,000   115,000   10
Maximum number of days receivables outstanding in Venezuela 90 days          
Impairments and other charges, net of tax   $ 312   $ 312 $ 262  
VENEZUELA            
Concentration Risk [Line Items]            
Allowance for Doubtful Accounts Receivable, Write-offs   119        
Write-off of promissory note in Venezuela   32        
Inventory Write-down   48        
Fixed asset write-offs in Venezuela   53        
Other asset and liability write-offs in Venezuela   13        
Accrued taxes portion of Venezuela investment write-down   $ 47        
Geographic Concentration Risk [Member] | UNITED STATES | Accounts Receivable [Member]            
Concentration Risk [Line Items]            
Concentration Risk, Percentage       47.00%   42.00%
[1] Represents a pre-tax charge of $265 million related to a write-down of all of our remaining investment in Venezuela, consisting of receivables, fixed assets, inventory and other assets and liabilities during the six months ended June 30, 2018 and $262 million for a fair market value adjustment related to Venezuela during the three and six months ended June 30, 2017. There were no such charges for the three months ended June 30, 2018.