Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues
Other revenue	$ 597	$ 563	$ 1,158	$ 1,123
Net investment income	610	562	1,185	1,156
Net gains (losses) on investments and derivatives	(151)	(733)	(137)	(1,000)
Total revenues	13,979	12,219	27,765	24,555
Costs and expenses
Property and casualty insurance claims and claims expense	11,727	9,367	22,053	17,189
Accident, health and other policy benefits	258	265	523	533
Amortization of deferred policy acquisition costs	1,789	1,618	3,533	3,226
Operating costs and expenses	1,786	1,850	3,502	3,752
Pension and other postretirement remeasurement (gains) losses	(40)	259	(93)	12
Restructuring and related charges	27	1	54	13
Amortization of purchased intangibles	82	87	163	174
Interest expense	98	83	184	166
Total costs and expenses	15,727	13,530	29,919	25,065
Loss from operations before income tax expense	(1,748)	(1,311)	(2,154)	(510)
Income tax benefit	(373)	(289)	(458)	(138)
Net loss	(1,375)	(1,022)	(1,696)	(372)
Less: Net loss attributable to noncontrolling interest	(23)	(9)	(24)	(19)
Net loss attributable to Allstate	(1,352)	(1,013)	(1,672)	(353)
Less: Preferred stock dividends	37	27	63	53
Net loss applicable to common shareholders, Basic	(1,389)	(1,040)	(1,735)	(406)
Net loss applicable to common shareholders, Diluted	$ (1,389)	$ (1,040)	$ (1,735)	$ (406)
Earnings per common share:
Net loss applicable to common shareholders per common share - Basic (in dollars per share)	$ (5.29)	$ (3.80)	$ (6.59)	$ (1.47)
Weighted average common shares - Basic (in shares)	262.6	273.8	263.1	275.9
Net loss applicable to common shareholders per common share - Diluted (in dollars per share)	$ (5.29)	$ (3.80)	$ (6.59)	$ (1.47)
Weighted average common shares - Diluted (in shares)	262.6	273.8	263.1	275.9
Property and casualty insurance premiums
Revenues
Insurance premiums and contract charges	$ 12,470	$ 11,362	$ 24,643	$ 22,343
Accident and health insurance premiums and contract charges
Revenues
Insurance premiums and contract charges	$ 453	$ 465	$ 916	$ 933