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Stock Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation cost related to non-vested awards not yet recognized |  | $ 68 |  |
Weighted average period of compensation cost recognized |  | 2 years |  |
Share-based Payment Arrangement, Plan Modification, Incremental Cost | $ 0 |  |  |
Maximum number of shares that may be issued (in shares) |  | 15,400,000 |  |
Shares available for future issuance (in shares) |  | 3,743,847 |  |
Award vesting period |  | 3 years |  |
Weighted average grant-date fair value of options granted during period (in shares) |  | $ 12.97 | $ 11.71 | $ 14.04
Total intrinsic value of options exercised during period |  | $ 2 | $ 16 | $ 14
Share-based Payment Arrangement, Cash Used to Settle Award |  | 0 | 0 | 0
Stock-based compensation plans expense |  | $ 116 | $ 125 | $ 130
Discount rate for employee stock purchase plan |  | 5.00% |  |
Shares sold during period (in shares) |  | 340,653 | 213,472 | 219,661
Weighted average per share fair value of discount (in USD per share) |  | $ 1.99 | $ 2.82 | $ 2.56
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 | $ 11 | $ 9
Subsidiary stock repurchased |  | $ 10 |  |
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) |  | $ 55.62 | $ 54.07 | $ 50.26
Total fair value of shares vested during period |  | $ 73 | $ 102 | $ 114
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) |  | $ 54.64 | $ 50.49 | $ 53.11
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) |  | 11,735,111 |  |
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 |  |
The Hartford 2020 Incentive Stock Plan (ISOP) [Member] | 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 2020 Incentive Stock Plan (ISOP) [Member] | Restricted Stock Units One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |
The Hartford 2020 Incentive Stock Plan (ISOP) [Member] | Restricted Stock Units Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Term |  | 5 years |  |
The Hartford 2020 Incentive Stock Plan (ISOP) [Member] | Restricted Stock Units | Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 1 year |  |
The Hartford 2020 Incentive Stock Plan (ISOP) [Member] | Restricted Stock Units | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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