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Restructuring (Tables)
12 Months Ended
Dec. 31, 2020
Restructuring and Related Activities [Abstract]  
Schedule of restructuring activity
The following table summarizes restructuring reserve activity during 2020 (in millions):

 
Employee Severance and Benefits
Accrued liability as of January 1, 2020$28 
Charges
Payments(34)
Accrued liability as of December 31, 2020$—