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Restructuring Restructuring Liability (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Reserve [Roll Forward]        
Beginning Balance     $ 132  
Restructuring Charges $ 65 $ 18 100 $ 101
Payments made during the period     (102) $ (92)
Foreign currency and other     (1)  
Ending Balance 129   129  
Employee Termination Benefits Liability        
Restructuring Reserve [Roll Forward]        
Beginning Balance     131  
Restructuring Charges     100  
Payments made during the period     (101)  
Foreign currency and other     (1)  
Ending Balance 129   129  
Other Exit Costs Liability        
Restructuring Reserve [Roll Forward]        
Beginning Balance     1  
Restructuring Charges     0  
Payments made during the period     (1)  
Foreign currency and other     0  
Ending Balance $ 0   $ 0