Revenue Recognition and Deferred Revenue (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Contract with Customer, Liability, Revenue Recognized	$ 0	$ 1
Revenue from Contract with Customer, Excluding Assessed Tax	15	9
Contract with Customer, Receivable, after Allowance for Credit Loss	8		$ 7
Contract with Customer, Asset, after Allowance for Credit Loss	10		5
Contract with Customer, Liability	1		$ 1
Contract with Customer, Performance Obligation Satisfied in Previous Period	3	4
Employer Stop Loss
Revenue from Contract with Customer, Excluding Assessed Tax	5	4
Affinity Products
Revenue from Contract with Customer, Excluding Assessed Tax	5	5
Commercial Auto
Revenue from Contract with Customer, Excluding Assessed Tax	3	0
Product and Service, Other
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1	$ 0
Minimum [Member]
Employee Stop Loss Time When Base Commissions Recognized Begin and End In Months	17
Maximum [Member]
Employee Stop Loss Time When Base Commissions Recognized Begin and End In Months	20