Reportable Segments - Schedule of Reportable Segments Total Assets, Investments and Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Segment Reporting
Assets	$ 124,756	$ 119,758
Investments	87,802	83,237
Deferred policy acquisition costs	6,139	6,163
Operating segments \| Allstate Protection and Run-off Property-Liability
Segment Reporting
Assets	105,240	102,801
Investments	75,307	73,222
Operating segments \| Allstate Protection and Run-off Property-Liability \| Allstate Protection
Segment Reporting
Deferred policy acquisition costs	2,806	2,803
Operating segments \| Protection Services
Segment Reporting
Assets	8,512	8,372
Investments	2,528	2,312
Deferred policy acquisition costs	3,232	3,274
Operating segments \| Corporate
Segment Reporting
Assets	10,020	7,610
Investments	9,774	7,503
All other
Segment Reporting
Assets	984	975
Investments	193	200
Deferred policy acquisition costs	$ 101	$ 86

Amount of asset recognized for present right to economic benefit.

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