Guarantees and Contingent Liabilities (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) claim
Biefeldt And IBEW
Proceedings:
Number of putative class actions | claim	2
Holland Hewitt v. Allstate Life Insurance Company
Proceedings:
Number of putative class actions | claim	2
Minimum
Proceedings:
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued | $	$ 0
Maximum
Proceedings:
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued | $	$ 142,000,000