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Contingencies - Asbestos (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
lawsuit
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 1993
USD ($)
Asbestos          
Sale of goods containing asbestos from 1948 to 1958 $ 40,000,000        
Number of pending plaintiffs and claimants | lawsuit 1,020        
Approximate number of claims disposed of to date | lawsuit 400,800        
Average indemnity payment per claim $ 10,000        
Asbestos-related cash payments   $ 105,000,000 $ 110,000,000 $ 125,000,000  
Cash payments per claim disposed including legal costs   86,000 83,000 71,000  
Asbestos-related liability, total amount accrued beginning in 1993 through current reporting period before insurance recoveries 5,000,000,000.0       $ 975,000,000
Accrual of asbestos related liability   602,000,000 582,000,000    
Asbestos related charges   $ 125,000,000 $ 0 $ 0  
Loss contingency, plaintiffs damages $ 722,000,000        
Minimum          
Asbestos          
Period in which significant majority of claims to be received 5 years        
Maximum          
Asbestos          
Period in which significant majority of claims to be received 7 years