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Commitments and Contingencies Personal Injury (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Loss Contingencies [Line Items]          
Accrual for loss contingencies, revisions in estimates $ 0 $ 29      
Unasserted Claim          
Asbestos and Personal Injury [Abstract]          
Percent of future unasserted asbestos claims to be filed within the next ten years 65.00%   65.00%    
Percent of future unasserted asbestos claims to be filed within the next fifteen years 80.00%   80.00%    
Percent of future unasserted asbestos claims to be filed within the next twenty-five years 95.00%   95.00%    
Length in years for 65 percent of future unasserted asbestos claims to be filed     10 years    
Length in years for 80 percent of future unasserted asbestos claims to be filed     15 years    
Length in years for 95 percent of future unasserted asbestos claims to be filed     25 years    
Personal Injury [Member]          
Asbestos and Personal Injury [Abstract]          
Loss Contingency, Accrual, Current $ 80   $ 80   $ 85
Loss Contingency Accrual [Roll Forward]          
Beginning balance 295 364 307 $ 367  
Accruals / changes in estimates 22 (24) 56 (6)  
Payments (16) (16) (62) (37)  
Ending balance 301 $ 324 301 $ 324  
Loss Contingency, Accrual, Current 80   80   $ 85
Personal Injury [Member] | Minimum [Member]          
Asbestos and Personal Injury [Abstract]          
Future costs to settle claims and associated liability 265   265    
Personal Injury [Member] | Maximum [Member]          
Asbestos and Personal Injury [Abstract]          
Future costs to settle claims and associated liability $ 360   $ 360