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Quarterly Operating Results (unaudited) (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Data [Line Items]                      
Reserve for revenues and accounts receivables $ 35                    
Restructuring and integration charges 47 $ 19 $ 25 $ 31 $ 42 $ 23 $ 23 $ 18      
Share-based compensation, excess tax benefit, amount 1 4 5 8 1 7 13 16 $ 18 $ 37 $ 9
Income tax benefit associated with changes in tax return accounting method     15           15    
Legal costs and gain associated with insurance claim     10                
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) 1                    
Decrease in contingent consideration and noncash impairment   12                  
Loss (gain) on disposition of business                 (4) 0 $ 118
Domestic Country [Member]                      
Quarterly Financial Data [Line Items]                      
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)         (106)         (106)  
Tax Cuts and Jobs Act of 2017, deferred tax expense (benefit)         (115)         (115)  
Tax Cuts and Jobs Act of 2017, current income tax expense (benefit)         9       $ 1 $ 9  
Income (Loss) from Equity Method Investments [Member]                      
Quarterly Financial Data [Line Items]                      
Restructuring and integration charges             1        
Other Nonoperating Income (Expense) [Member]                      
Quarterly Financial Data [Line Items]                      
Gain related to sale             7        
Discontinued Operations, Disposed of by Sale [Member]                      
Quarterly Financial Data [Line Items]                      
Loss (gain) on disposition of business (4)                    
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member]                      
Quarterly Financial Data [Line Items]                      
Asset impairment charges and costs incurred as a result of hurricanes         6 9          
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] | Other Nonoperating Income (Expense) [Member]                      
Quarterly Financial Data [Line Items]                      
Asset impairment charges and costs incurred as a result of hurricanes           5          
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] | Cost of Sales [Member]                      
Quarterly Financial Data [Line Items]                      
Asset impairment charges and costs incurred as a result of hurricanes         2 3          
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] | Selling, General and Administrative Expenses [Member]                      
Quarterly Financial Data [Line Items]                      
Asset impairment charges and costs incurred as a result of hurricanes         4 1          
Cost of Sales [Member]                      
Quarterly Financial Data [Line Items]                      
Restructuring and integration charges 20 10 14 12 14 12 9 10      
Legal costs and gain associated with insurance claim     11                
Decrease in contingent consideration and noncash impairment   1                  
Selling, General and Administrative Expenses [Member]                      
Quarterly Financial Data [Line Items]                      
Restructuring and integration charges $ 27 9 11 18 $ 28 $ 11 13 $ 8      
Selling, General and Administrative Expenses [Member] | Legal Matters [Member]                      
Quarterly Financial Data [Line Items]                      
Legal costs             $ 2        
Other Operating Income (Expense) [Member]                      
Quarterly Financial Data [Line Items]                      
Restructuring and integration charges       $ 1              
Legal costs and gain associated with insurance claim     $ 1                
Decrease in contingent consideration and noncash impairment   $ 13