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Restructuring and Related Implementation Charges - Narrative (Details) - Global Growth and Efficiency Program - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]      
Payments for restructuring $ 13 $ 30  
Restructuring reserve $ 19   $ 31