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Employee Benefit Plans - Post Retirement Benefit Plans, Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maximum percentage of plan assets that can be in the common stock of Hartford |  | 10.00% |  |
Non-elective contribution percent |  | 2.00% |  |
Percent of employer matching contribution |  | 6.00% |  |
Limit of employee compensation annually |  | $ 1,000,000 |  |
Total cost to company related to Investment and Savings Plan |  | $ 193,000,000 | $ 163,000,000 | $ 142,000,000
Defined Benefit Plan, Assumptions Used in Calculation, Description |  | The interest crediting rate on the cash balance plan is the greater of the average annual yield on 10-year U.S. Treasury Securities published in December of the prior calendar year or 3.3%. |  |
Fair value of plan assets had fair value of rabbi trusts been included |  | $ 3,641,000,000 | 3,771,000,000 |
Funded status of plan had fair value of rabbi trust assets been included |  | $ 253,000,000 | $ 168,000,000 |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 5.65% |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |  | 5.90% | 6.10% |
Defined Benefit Plan, Benefit Obligation |  | $ 3,388,000,000 | $ 3,603,000,000 | 3,490,000,000
Assets held in rabbi trusts and designated for the non-qualified pension plans |  | 245,000,000 | 198,000,000 |
Assets held in rabbi trusts and designated for non qualified pension plans, contributions by employer |  | 0 | 3,000,000 |
Plan assets at fair value in the fair value hierarchy |  | $ 3,396,000,000 | 3,573,000,000 | $ 3,524,000,000
Pension Plan [Member] | Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 6.40% |  |  |
Pension Plan [Member] | Fixed income securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 81.00% |  |
Pension Plan [Member] | Fixed income securities | Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 81.00% |  |  |
Pension Plan [Member] | Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 19.00% |  |
Pension Plan [Member] | Equity Securities [Member] | Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 19.00% |  |  |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value in the fair value hierarchy |  | $ 1,000,000 | $ 1,000,000 |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 5.56% | 5.13% | 5.39%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |  | 4.50% | 4.50% | 4.80%
Defined Benefit Plan, Benefit Obligation |  | $ 122,000,000 | $ 138,000,000 | $ 143,000,000
Plan assets at fair value in the fair value hierarchy |  | $ 8,000,000 | $ 18,000,000 | $ 30,000,000
Other Postretirement Benefits Plan [Member] | Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 4.80% |  |  |
Other Postretirement Benefits Plan [Member] | Fixed income securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 100.00% | 100.00% |
Other Postretirement Benefits Plan [Member] | Fixed income securities | Forecast [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |  |  |
Other Postretirement Benefits Plan [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value in the fair value hierarchy |  | $ 0 | $ 0 |
Other Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 5.59% | 5.14% | 5.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |  | 4.00% | 4.40% | 3.30%
Defined Benefit Plan, Benefit Obligation |  | $ 313,000,000 | $ 334,000,000 | $ 334,000,000
Plan assets at fair value in the fair value hierarchy |  | $ 9,000,000 | $ 11,000,000 | $ 11,000,000
Other Pension Plan | Change in Assumptions for Defined Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 5.59% | 5.14% | 5.40%
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) |  | $ (12,000,000) | $ (7,000,000) |
Cash Balance Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation |  | 332,000,000 | 357,000,000 |
Foreign Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total cost to company related to Investment and Savings Plan |  | $ 3,000,000 | $ 3,000,000 | $ 3,000,000
UNITED STATES | Change in Assumptions for Defined Benefit Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 5.65% | 5.15% | 5.43%
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) |  | $ (145,000,000) | $ (88,000,000) |
UNITED STATES | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 5.65% | 5.15% | 5.43%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets |  | 5.90% | 6.10% | 5.10%
Defined Benefit Plan, Benefit Obligation |  | $ 3,075,000,000 | $ 3,269,000,000 | $ 3,156,000,000
Plan assets at fair value in the fair value hierarchy |  | $ 3,387,000,000 | $ 3,562,000,000 | $ 3,513,000,000

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- Definition Assets held in rabbi trusts and designated for non qualified pension plans. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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