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Stock Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation cost related to non-vested awards not yet recognized | $ 70 |  |
Weighted average period of compensation cost recognized | 2 years |  |
Maximum number of shares that may be issued (in shares) | 15,400,000 |  |
Shares available for future issuance (in shares) | 4,084,500 |  |
Award vesting period | 3 years |  |
Weighted average grant-date fair value of options granted during period (in shares) | $ 11.71 | $ 14.04 | $ 12.38
Total intrinsic value of options exercised during period | $ 16 | $ 14 | $ 8
Share-based Payment Arrangement, Cash Used to Settle Award | 0 | 0 | 0
Stock-based compensation plans expense | $ 125 | $ 130 | $ 116
Discount rate for employee stock purchase plan | 5.00% |  |
Shares sold during period (in shares) | 213,472 | 219,661 | 204,533
Weighted average per share fair value of discount (in USD per share) | $ 2.82 | $ 2.56 | $ 2.63
Discount rate from market price per share, purchase date | 5.00% |  |
Subsidiary Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation plans expense | $ 11 | $ 9 | $ 9
Subsidiary stock repurchased | $ 8 |  |
Employee Stock Option Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term | 3 years | 3 years | 3 years
Stock-based Compensation Arrangement by Share-based Payment Award, Performance Period | 3 years |  |
Weighted average grant-date fair value (in USD per share) | $ 54.07 | $ 50.26 | $ 48.89
Total fair value of shares vested during period | $ 102 | $ 114 | $ 94
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% |  |
Performance Shares One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Performance Shares Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
Restricted Stock and Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant-date fair value (in USD per share) | $ 50.49 | $ 53.11 | $ 48.90
The Hartford 2014 Incentive Stock Plan (ISOP) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term | 10 years |  |
Maximum number of shares that may be issued (in shares) | 12,000,000 |  |
Shares available for future issuance (in shares) | 5,268,108 |  |
The Hartford 2014 Incentive Stock Plan (ISOP) | Employee Stock Option | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term | 10 years |  |
The Hartford 2014 Incentive Stock Plan (ISOP) | Employee Stock Option One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Service period | 1 year |  |
The Hartford 2014 Incentive Stock Plan (ISOP) | Restricted Stock Units One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
The Hartford 2014 Incentive Stock Plan (ISOP) | Restricted Stock Units Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Term | 5 years |  |
The Hartford 2014 Incentive Stock Plan (ISOP) | Restricted Stock Units | Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 1 year |  |
The Hartford 2014 Incentive Stock Plan (ISOP) | Restricted Stock Units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |

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