Reportable Segments - Schedule of Reportable Segments Total Assets, Investments and Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Segment Reporting
Assets	$ 127,849	$ 119,758
Investments	87,375	83,237
Deferred policy acquisition costs	6,213	6,163
Operating segments \| Allstate Protection and Run-off Property-Liability
Segment Reporting
Assets	109,128	102,801
Investments	75,624	73,222
Operating segments \| Allstate Protection and Run-off Property-Liability \| Allstate Protection
Segment Reporting
Deferred policy acquisition costs	2,863	2,803
Operating segments \| Protection Services
Segment Reporting
Assets	8,117	8,372
Investments	2,499	2,312
Deferred policy acquisition costs	3,243	3,274
Operating segments \| Corporate
Segment Reporting
Assets	9,715	7,610
Investments	9,102	7,503
All other
Segment Reporting
Assets	889	975
Investments	150	200
Deferred policy acquisition costs	$ 107	$ 86

Amount of asset recognized for present right to economic benefit.

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