Statutory Financial Information and Dividend Limitations - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
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	$ 18,635,000,000	$ 14,560,000,000
Restricted net assets	25,490,000,000
Allstate Insurance Company
Dividend Limitations
Dividends paid	0
Maximum amount of dividends without prior approval	$ 3,950,000,000
Advance notice period required for payment of dividend in excess of amount available for distribution without prior approval (in days)	30 days
Unassigned surplus excluding unrealized appreciation from investments	$ 11,270,000,000
Adjusted capital and surplus	16,270,000,000
Authorized control level RBC	$ 3,840,000,000