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Restructuring and Related Implementation Charges - Restructuring Activity and Related Accruals (Details) - Global Growth and Efficiency Program - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Restructuring Reserve [Roll Forward]        
Beginning Balance $ 64   $ 100  
Charges (Benefits) (16) $ 27 (16) $ 98
Cash payments (15)   (50)  
Charges against assets 0   0  
Foreign exchange 1   0  
Other 0   0  
Ending Balance $ 34   $ 34