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Stock Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation cost related to non-vested awards not yet recognized | $ 71 |  |
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) | 3,544,674 |  |
Award vesting period | 3 years |  |
Weighted average grant-date fair value of options granted during period (in shares) | $ 14.88 | $ 12.97 | $ 11.71
Proceeds from Stock Options Exercised | $ 45 | $ 3 | $ 24
Share-based Payment Arrangement, Exercise of Option, Tax Benefit | 4 | 0 | 2
Total intrinsic value of options exercised during period | 28 | 2 | 16
Share-based Payment Arrangement, Cash Used to Settle Award | 0 | 0 | 0
Stock-based compensation plans expense | $ 128 | $ 116 | $ 125
Discount rate for employee stock purchase plan | 5.00% |  |
Shares sold during period (in shares) | 199,173 | 340,653 | 213,472
Share-based Compensation Arrangement by Share-based Payment Award, Cash Received from Shares Issued in Period | $ 13 | $ 13 | $ 11
Subsidiary Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation plans expense | 11 | 11 | 11
Subsidiary stock repurchased | $ 16 | $ 10 | $ 8
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 | 765,000 | 790,000 |
Weighted average grant-date fair value (in USD per share) | $ 56.09 | $ 55.62 | $ 54.07
Total fair value of shares vested during period | $ 105 | $ 73 | $ 102
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 | 30,000 | 11,000 |
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 | 4,031,000 | 3,866,000 |
Weighted average grant-date fair value (in USD per share) | $ 52.13 | $ 54.64 | $ 50.49
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 | 209,000 | 186,000 |
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) | 9,667,290 |  |
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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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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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- 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 The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -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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