Condensed Consolidated Statements of Shareholders’ Equity (unaudited) - USD ($) $ in Millions	Total	Preferred stock par value	Preferred stock additional capital paid-in	Common stock par value	Common stock additional capital paid-in	Retained income	Treasury stock	Accumulated other comprehensive income (loss)	Noncontrolling interest
Balance, beginning of period at Dec. 31, 2023					$ 3,854	$ 49,716	$ (37,110)	$ (700)	$ (140)
Increase (decrease) in equity
Equity incentive plans activity, net					40
Net income (loss)	$ 1,198					1,218			(20)
Dividends on common stock (declared per share of $1.00 and $0.92)						(243)
Dividends on preferred stock						(29)
Shares acquired							0
Shares reissued under equity incentive plans, net							66
Change in unrealized net capital gains and losses	(215)							(215)	1
Change in unrealized foreign currency translation adjustments	8							8
Change in unamortized pension and other postretirement prior service credit	(1)							(1)
Change in discount rate for reserve for future policy benefits	25							25
Capital transactions for noncontrolling interest									0
Balance, end of period at Mar. 31, 2024	18,480	$ 0	$ 2,001	$ 9	3,894	50,662	(37,044)	(883)	(159)
Increase (decrease) in equity
Total Allstate shareholders’ equity	18,639
Total Allstate shareholders’ equity	21,442
Balance, beginning of period at Dec. 31, 2024	21,367				4,029	53,288	(36,996)	(889)	(75)
Increase (decrease) in equity
Equity incentive plans activity, net					19
Net income (loss)	596					595			1
Dividends on common stock (declared per share of $1.00 and $0.92)						(268)
Dividends on preferred stock						(29)
Shares acquired							(105)
Shares reissued under equity incentive plans, net							21
Change in unrealized net capital gains and losses	420							420	4
Change in unrealized foreign currency translation adjustments	(45)							(45)
Change in unamortized pension and other postretirement prior service credit	0							0
Change in discount rate for reserve for future policy benefits	5							5
Capital transactions for noncontrolling interest									67
Balance, end of period at Mar. 31, 2025	22,052	$ 0	$ 2,001	$ 9	$ 4,048	$ 53,586	$ (37,080)	$ (509)	$ (3)
Increase (decrease) in equity
Total Allstate shareholders’ equity	$ 22,055