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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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