Cover Document - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2019	Feb. 19, 2020	Jun. 28, 2019
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-13958
Entity Registrant Name	THE HARTFORD FINANCIAL SERVICES GROUP, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3317783
Entity Address, Address Line One	One Hartford Plaza
Entity Address, City or Town	Hartford
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06155
City Area Code	860
Local Phone Number	547-5000
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
Entity Shell Company	false
Entity Public Float			$ 20
Entity Common Stock, Shares Outstanding		358,252,183
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for its 2020 annual meeting of stockholders are incorporated by reference in Part III of this Form 10-K.
Entity Central Index Key	0000874766
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock, par value $0.01 per share
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	HIG
Security Exchange Name	NYSE
6.10% Notes due October 1, 2041
Title of 12(b) Security	6.10% Notes due October 1, 2041
Trading Symbol	HIG 41
Security Exchange Name	NYSE
7.875% Fixed-to-Floating Rate Junior Subordinated Debentures due 2042
Title of 12(b) Security	7.875% Fixed-to-Floating Rate Junior Subordinated Debentures due 2042
Trading Symbol	HGH
Security Exchange Name	NYSE
Depositary Shares, Each Representing a 1/1,000th Interest in a Share of 6.000% Non-Cumulative Preferred Stock, Series G, par value $0.01 per share
Title of 12(b) Security	Depositary Shares, Each Representing a 1/1,000th Interest in a Share of 6.000% Non-Cumulative Preferred Stock, Series G, par value $0.01 per share
Trading Symbol	HIG PR G
Security Exchange Name	NYSE