Stock Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 75
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)	3,014,109
Award vesting period	3 years
Weighted average grant-date fair value of options granted during period (in shares)	$ 25.77	$ 21.09	$ 16.56
Proceeds from Stock Options Exercised	$ 92	$ 47	$ 26
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	4	3	3
Total intrinsic value of options exercised during period	99	35	24
Share-based Payment Arrangement, Cash Used to Settle Award	0	0	0
Stock-based compensation plans expense	$ 133	$ 125	$ 131
Discount rate for employee stock purchase plan	5.00%
Shares sold during period (in shares)	141,500	194,561	194,504
Share-based Compensation Arrangement by Share-based Payment Award, Cash Received from Shares Issued in Period	$ 14	$ 13	$ 13
Subsidiary Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation plans expense	12	12	13
Subsidiary stock repurchased	$ 10	$ 11	$ 10
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	594,000	583,000
Weighted average grant-date fair value (in USD per share)	$ 103.08	$ 85.69	$ 71.54
Total fair value of shares vested during period	$ 186	$ 154	$ 134
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	14,000	18,000
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	2,678,000	3,259,000
Weighted average grant-date fair value (in USD per share)	$ 96.34	$ 77.72	$ 69.32
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	107,000	155,000
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)	6,253,061
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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