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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Goodwill
Goodwill allocated to segments	$ 3,502	$ 3,502
Allstate Protection
Goodwill
Goodwill allocated to segments	1,563	1,563
Protection Services
Goodwill
Goodwill allocated to segments	1,494	1,494
Allstate Health and Benefits
Goodwill
Goodwill allocated to segments	$ 445	$ 445

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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