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Restructuring and Other Charges - Restructuring Reserve Activity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restructuring Reserve    
Accrued liability, beginning of period $ 55  
Charges 32 $ 29
Payments (31)  
Accrued liability, end of period $ 56