Stock Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 64
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years
Maximum number of shares that may be issued (in shares)	15,400,000
Shares available for future issuance (in shares)	3,155,609
Award vesting period	3 years
Weighted average grant-date fair value of options granted during period (in shares)	$ 21.09	$ 16.56	$ 14.88
Proceeds from Stock Options Exercised	$ 47	$ 26	$ 45
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	3	3	4
Total intrinsic value of options exercised during period	35	24	28
Share-based Payment Arrangement, Cash Used to Settle Award	0	0	0
Stock-based compensation plans expense	$ 125	$ 131	$ 128
Discount rate for employee stock purchase plan	5.00%
Shares sold during period (in shares)	194,561	194,504	199,173
Share-based Compensation Arrangement by Share-based Payment Award, Cash Received from Shares Issued in Period	$ 13	$ 13	$ 13
Subsidiary Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation plans expense	12	13	11
Subsidiary stock repurchased	$ 11	$ 10	$ 16
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term	3 years	3 years	3 years
Award vesting period	3 years
Stock-based Compensation Arrangement by Share-based Payment Award, Performance Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	583,000	711,000
Weighted average grant-date fair value (in USD per share)	$ 85.69	$ 71.54	$ 56.09
Total fair value of shares vested during period	$ 154	$ 134	$ 105
Performance Shares \| Dividend Equivalent Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	18,000	25,000
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance ratio	200.00%
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target performance ratio	0.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	3,259,000	3,517,000
Weighted average grant-date fair value (in USD per share)	$ 77.72	$ 69.32	$ 52.13
Restricted Stock Units \| Dividend Equivalent Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	155,000	182,000
The Hartford 2020 Incentive Stock Plan (ISOP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term	10 years
Maximum number of shares that may be issued (in shares)	11,250,000
Shares available for future issuance (in shares)	6,884,152
The Hartford 2020 Incentive Stock Plan (ISOP) [Member] \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Service period	1 year
The Hartford 2020 Incentive Stock Plan (ISOP) [Member] \| Employee Stock Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term	10 years

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