Statutory Financial Information and Dividend Limitations - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Dividend Limitations
Action level RBC expressed as a multiplier of authorized control level RBC, which if not achieved would require specific actions to be taken	2
Capital and surplus	$ 14,560,000,000	$ 15,276,000,000
Restricted net assets	21,180,000,000
Allstate Insurance Company
Dividend Limitations
Dividends paid	0
Maximum amount of dividends without prior approval	$ 1,200,000,000
Advance notice period required for payment of dividend in excess of amount available for distribution without prior approval	30 days
Unassigned surplus excluding unrealized appreciation from investments	$ 7,150,000,000
Capital and surplus	11,990,000,000
Authorized control level RBC	$ 3,070,000,000.00