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Commitments and Contingencies Personal Injury (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
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]          
Accrued obligations for asbestos and other personal injury matters, current liabilities $ 80   $ 80   $ 85
Loss Contingency Accrual [Roll Forward]          
Beginning balance 364 $ 369 367 $ 375  
Accruals / changes in estimates (24) 16 (6) 66  
Payments (16) (23) (37) (79)  
Ending balance 324 362 324 $ 362  
Personal Injury [Member] | Minimum [Member]          
Asbestos and Personal Injury [Abstract]          
Future costs to settle claims and associated liability 280   280    
Personal Injury [Member] | Maximum [Member]          
Asbestos and Personal Injury [Abstract]          
Future costs to settle claims and associated liability 390   $ 390    
Asbestos Issue [Member]          
Loss Contingencies [Line Items]          
Decrease in asbestos liability $ 29 $ 0