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Restructuring (Tables)
9 Months Ended
Sep. 30, 2021
Restructuring and Related Activities [Abstract]  
Schedule of restructuring activity
The following table summarizes restructuring reserve activity for the period indicated (in millions):
 Employee Severance and Benefits
Accrued liability as of January 1, 2021$— 
Charges35 
Payments(30)
Accrued liability as of September 30, 2021$