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Restructuring and Related Activities (Tables)
12 Months Ended
Dec. 31, 2023
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
Restructuring and Other Costs, Before Tax
Incurred in the Year Ended December 31, 2021Incurred in the Year Ended December 31, 2022Incurred in the Year Ended December 31, 2023Cumulative Incurred in the Year Ended December 31, 2023Total Amount Expected to be Incurred
Severance benefits$(25)$(7)$(6)$35 $35 
IT costs25 25 
Professional fees and other expenses17 12 64 66 
Total restructuring and other costs, before tax$1 $13 $6 $124 $126 
Schedule of Restructuring Reserve by Type of Cost
Accrued Restructuring and Other Costs
Year Ended December 31, 2023
Severance Benefits and Related CostsIT CostsProfessional Fees and OtherTotal Restructuring and Other Costs Liability
Balance, beginning of period$7 $ $ $7 
Incurred(6)
Payments(1)(5)(7)(13)
Balance, end of period$ $ $ $ 
Accrued Restructuring and Other Costs
Year Ended December 31, 2022
Severance Benefits and Related CostsIT CostsProfessional Fees and OtherTotal Restructuring and Other Costs Liability
Balance, beginning of period$18 $ $ $18 
Incurred(7)12 13 
Payments(4)(8)(12)(24)
Balance, end of period$7 $ $ $7