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Summary of Significant Accounting Policies - Schedule of Unearned Premiums (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred Policy Acquisition and Sales Inducement Costs:
Unearned premiums	$ 29,080	$ 26,909
All other
Deferred Policy Acquisition and Sales Inducement Costs:
Unearned premiums	11	14
Protection Services | Operating segments
Deferred Policy Acquisition and Sales Inducement Costs:
Unearned premiums	5,605	5,385
Allstate Health and Benefits | Operating segments
Deferred Policy Acquisition and Sales Inducement Costs:
Unearned premiums	$ 0	$ 2

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- References

No definition available.

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- Definition

Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(13)(a)(2))
-SubTopic 210
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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