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Cover - USD ($) $ in Millions	12 Months Ended
Cover - USD ($) $ in Millions	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-11840
Entity Registrant Name	ALLSTATE CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3871531
Entity Address, Address Line One	3100 Sanders Road
Entity Address, City or Town	Northbrook
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60062
City Area Code	847
Local Phone Number	402-5000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction Flag	false
Entity Shell Company	false
Entity Public Float			$ 28,400
Entity Common Stock, Shares Outstanding		263,067,415
Documents Incorporated by Reference	Documents Incorporated By Reference Portions of the following documents are incorporated herein by reference as follows: Part III of this Form 10-K incorporates by reference certain information from the registrant’s definitive proxy statement for its annual stockholders meeting to be held on May 14, 2024, (the “Proxy Statement”) to be filed not later than 120 days after the end of the fiscal year covered by this Form 10-K.
Entity Central Index Key	0000899051
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock, par value $0.01 per share \| NEW YORK STOCK EXCHANGE, INC.
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	ALL
Security Exchange Name	NYSE
Common Stock, par value $0.01 per share \| CHICAGO STOCK EXCHANGE, INC
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	ALL
Security Exchange Name	CHX
5.100% Fixed-to-Floating Rate Subordinated Debentures due 2053 \| NEW YORK STOCK EXCHANGE, INC.
Document Information [Line Items]
Title of 12(b) Security	5.100% Fixed-to-Floating Rate Subordinated Debentures due 2053
Trading Symbol	ALL.PR.B
Security Exchange Name	NYSE
Depositary Shares represent 1/1,000th of a share of 5.100% Noncumulative Preferred Stock, Series H \| NEW YORK STOCK EXCHANGE, INC.
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares represent 1/1,000th of a share of 5.100% Noncumulative Preferred Stock, Series H
Trading Symbol	ALL PR H
Security Exchange Name	NYSE
Depositary Shares represent 1/1,000th of a share of 4.750% Noncumulative Preferred Stock, Series I \| NEW YORK STOCK EXCHANGE, INC.
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares represent 1/1,000th of a share of 4.750% Noncumulative Preferred Stock, Series I
Trading Symbol	ALL PR I
Security Exchange Name	NYSE
Depositary Shares represent 1/1,000th of a share of 7.375% Noncumulative Preferred Stock, Series J \| NEW YORK STOCK EXCHANGE, INC.
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares represent 1/1,000th of a share of 7.375% Noncumulative Preferred Stock, Series J
Trading Symbol	ALL PR J
Security Exchange Name	NYSE