Variable Interest Entities - Narrative (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Variable Interest Entity [Line Items]
Notes payable	$ 123		$ 123		$ 123
Allstate Protection
Variable Interest Entity [Line Items]
Insurance premiums and contract charges	(57)	$ 41	114	$ 83
Costs and expenses	$ 85	$ 55	$ 144	$ 113