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Restructuring and Related Activities (Tables)
6 Months Ended
Jun. 30, 2021
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
Restructuring and Other Costs, Before Tax
Incurred in the Three Months Ended June 30, 2021Incurred in the Six Months Ended June 30, 2021 Cumulative Incurred Through June 30, 2021Total Amount Expected to be Incurred
Severance benefits$(9)$(9)$64 $64 
IT costs27 
Professional fees and other expenses16 45 61 
Total restructuring and other costs, before tax$ $11 $115 $152 
Schedule of Restructuring Reserve by Type of Cost
Accrued Restructuring and Other Costs
Six Months Ended June 30, 2021
Severance Benefits and Related CostsIT CostsProfessional Fees and OtherTotal Restructuring and Other Costs Liability
Balance, beginning of period$54 $ $ $54 
Incurred(9)16 11 
Payments(8)(4)(15)(27)
Balance, end of period$37 $ $1 $38