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Restructuring of Operations - Accrued Restructuring Costs and Activity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]      
Beginning balance $ 29 $ 26 $ 38
Charges to restructuring 31 32 22
Adjustments of accruals (2) (7) (8)
Cash payments (40) (21) (28)
Currency impact 0 (1) 2
Lease cease-use reclassification (4)    
Ending Balance 14 29 26
Employee Termination Benefits [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 25 21 32
Charges to restructuring 21 28 16
Adjustments of accruals (2) (7) (8)
Cash payments (31) (16) (21)
Currency impact (1) 2
Ending Balance 13 25 21
Exit Costs [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 4 5 6
Charges to restructuring 10 4 6
Adjustments of accruals  
Cash payments (9) (5) (7)
Currency impact    
Lease cease-use reclassification (4)    
Ending Balance $ 1 $ 4 $ 5