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Stock Compensation Plans - Stock Option Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number of Options (in thousands) |  |  |
Outstanding at beginning of year (in shares) | 5,846 |  |
Granted (in shares) | 998 |  |
Exercised (in shares) | (128) |  |
Forfeited (in shares) | (23) |  |
Expired (in shares) | 0 |  |
Outstanding at end of year (in shares) | 6,693 | 5,846 |
Number of Options (in thousands), Outstanding, fully vested and expected to vest (in shares) | 6,693 |  |
Number of Options (in thousands), Exercisable at end of year (in shares) | 4,793 |  |
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year (in USD per share) | $ 43.43 |  |
Granted (in USD per share) | 55.27 |  |
Exercised (in USD per share) | 24.15 |  |
Forfeited (in USD per share) | 51.27 |  |
Expired (in USD per share) | 0 |  |
Outstanding at end of year (in USD per share) | 45.54 | $ 43.43 |
Weighted Average Exercise Price, Outstanding, fully vested and expected to vest (in USD per share) | 63.59 |  |
Weighted Average Exercise Price, Exercisable at end of year (in USD per share) | $ 42.62 |  |
Weighted Average Remaining Contractual Term, Outstanding at end of year | 5 years 9 months 18 days |  |
Weighted Average Remaining Contractual Term, Outstanding, fully vested and expected to vest | 5 years 9 months 18 days |  |
Weighted Average Remaining Contractual Term, Exercisable at end of year | 4 years 8 months 12 days |  |
Aggregate Intrinsic Value, Outstanding at end of year | $ 34 |  |
Aggregate Intrinsic Value, Outstanding, fully vested and expected to vest | 33 |  |
Aggregate Intrinsic Value, Exercisable at end of year | $ 34 |  |
The Hartford 2020 Incentive Stock Plan (ISOP) [Member] |  |  |
Weighted Average Exercise Price |  |  |
Term | 10 years |  |
Employee Stock Option |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Expected dividend yield | 2.60% | 2.50% | 1.80%
Expected annualized spot volatility minimum | 22.20% | 20.70% | 20.80%
Expected annualized spot volatility maximum | 36.20% | 36.70% | 36.50%
Weighted average annualized volatility | 30.90% | 29.30% | 29.00%
Risk-free spot rate minimum | 1.30% | 2.40% | 1.50%
Risk-free spot rate maximum | 1.60% | 2.60% | 2.90%
Expected term | 6 years 7 months 6 days | 5 years 10 months 24 days | 5 years 8 months 12 days

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