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Document and Entity Information Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Document Information [Line Items]
Entity Central Index Key	0000899051
Entity Filer Category	Large Accelerated Filer
Entity Incorporation, State or Country Code	DE
Entity Common Stock, Shares Outstanding		316,913,648
Document Type	10-K
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	1-11840
Entity Registrant Name	ALLSTATE CORP
Entity Address, Address Line One	2775 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 Shell Company	false
Entity Public Float			$ 33,040
Entity Tax Identification Number	36-3871531
Entity Small Business	false
Entity Emerging Growth Company	false
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 19, 2020, (the “Proxy Statement”) to be filed not later than 120 days after the end of the fiscal year covered by this Form 10-K.
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Common stock par value \| CHICAGO STOCK EXCHANGE, INC
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	ALL
Security Exchange Name	CHX
Common stock par value \| NEW YORK STOCK EXCHANGE, INC.
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	ALL
Security Exchange Name	NYSE
5.100% 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
Series G Preferred Stock \| NEW YORK STOCK EXCHANGE, INC.
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares represent 1/1,000th of a share of 5.625% Noncumulative Preferred Stock, Series G
Trading Symbol	ALL PR G
Security Exchange Name	NYSE
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
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