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Restructuring and Related Implementation Charges - Narrative (Details) - Global Growth and Efficiency Program - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]      
Payments for restructuring $ 15 $ 35  
Restructuring reserve $ 17   $ 31