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Contingencies - Asbestos (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
item
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 1993
USD ($)
Asbestos            
Sale of goods containing asbestos from 1948 to 1958 $ 40,000,000          
Number of pending plaintiffs and claimants | item 1,270          
Period in which significant majority of claims to be received 10 years          
Approximate number of claims disposed of to date | item 399,000          
Average indemnity payment per claim $ 9,600          
Payments for Asbestos-Related Liabilities 7,000,000 $ 12,000,000 $ 110,000,000 $ 125,000,000 $ 138,000,000  
Cash payments per claim disposed including legal costs     83,000 71,000 95,000  
Asbestos-related liability, total amount accrued beginning in 1993 through 2016 before insurance recoveries $ 4,900,000,000         $ 975,000,000
Accrual of asbestos related liability     582,000,000 692,000,000    
Asbestos related charges     0 $ 0 $ 16,000,000  
Maximum            
Asbestos            
Loss contingency, plaintiffs damages     $ 725,000,000      
Damages unspecified or sufficient to invoke jurisdictional minimum            
Asbestos            
Percentage of asbestos plaintiffs, approximate percentage     89.00%      
Damages of $15 million or less            
Asbestos            
Percentage of asbestos plaintiffs, approximate percentage     8.00%      
Damages of $15 million or less | Minimum            
Asbestos            
Loss contingency, plaintiffs damages     $ 15,000,000      
Damages greater than $15 million but less than $100 million            
Asbestos            
Percentage of asbestos plaintiffs, approximate percentage     3.00%      
Damages greater than $15 million but less than $100 million | Minimum            
Asbestos            
Loss contingency, plaintiffs damages     $ 15,000,000      
Damages greater than $15 million but less than $100 million | Maximum            
Asbestos            
Loss contingency, plaintiffs damages     $ 100,000,000