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Debt - Additional Information (Details) £ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2019 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 17, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Mar. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Aug. 19, 2019 USD ($) | May 23, 2019 USD ($) | Jan. 15, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  | $ 236,000,000 | $ 259,000,000 | $ 298,000,000 |  |  |  |  |  |  |  |  |
Registration Payment Arrangement, Term | three |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs |  | $ 1,380,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 0 | $ 90,000,000 | $ 6,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Payment Terms |  | The Company has the right to defer interest payments for up to a consecutive ten years without giving rise to an event of default. Deferred interest will continue to accrue and will accrue additional interest at the then applicable interest rate. If the Company defers interest payments, the Company generally may not make payments on or redeem or purchase any shares of its capital stock or any of its debt securities or guarantees that rank upon liquidation, dissolution or winding up equally with or junior to the debentures, subject to certain limited exceptions. |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Description |  | The Company has a senior unsecured five-year revolving credit facility (“Credit Facility”) that provides up to $750 of unsecured credit through March 29, 2023. Revolving loans from the Credit Facility may be in multiple currencies. U.S. dollar loans will bear interest at a floating rate equivalent to an indexed rate depending on the type of borrowing and a basis point spread based on The Hartford's credit rating and will mature no later than March 29, 2023. Letters of credit issued from the Credit Facility bear a fee based on The Hartford's credit rating and expire no later than March 29, 2024. The Credit Facility requires the Company to maintain a minimum consolidated net worth, excluding AOCI, of $9 billion, limit the ratio of senior debt to capitalization, excluding AOCI, at 35% and meet other customary covenants. The Credit Facility is for general corporate purposes. |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Borrowing Capacity, Description |  | The Company has a senior unsecured five-year revolving credit facility (“Credit Facility”) that provides up to $750 of unsecured credit through March 29, 2023. Revolving loans from the Credit Facility may be in multiple currencies. U.S. dollar loans will bear interest at a floating rate equivalent to an indexed rate depending on the type of borrowing and a basis point spread based on The Hartford's credit rating and will mature no later than March 29, 2023. Letters of credit issued from the Credit Facility bear a fee based on The Hartford's credit rating and expire no later than March 29, 2024. The Credit Facility requires the Company to maintain a minimum consolidated net worth, excluding AOCI, of $9 billion, limit the ratio of senior debt to capitalization, excluding AOCI, at 35% and meet other customary covenants. The Credit Facility is for general corporate purposes. |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  | 0 |  |  |  |  |  |  |  |  |  |  |
Credit facility |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Affordable Housing Program, Principal Outstanding |  | 0 |  |  |  |  |  |  |  |  |  |  |
Maximum | Hartford Fire Insurance Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral Amount |  | 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum | Hartford Life and Accident Insurance Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral Amount |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |
Club Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 165,000,000 |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  | 78,000,000 | £ 60 |  |  |  |  |
Club Facility [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 104,000,000 |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | 104,000,000 |  |  |  |  |  |  |  |  |  |  |
Club Facility [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 116,000,000 |  |  | £ 85 |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | 116,000,000 |  |  | £ 85 |  |  |  |  |  |  |  |
Bilateral Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 25,000,000 |  |  |  |  | 25,000,000 |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  | $ 0 |  |  |  |  | $ 23,000,000 | £ 18 |  |  |  |  |
Senior Note Six Point One Percent Due in Two Thousand Forty One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 7.90% |  |  | 7.90% |  |  |  |  |  |  |  |
Senior Note Five Point Five Percent Due in Two Thousand Twenty [Member] | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Senior Note Six Point Zero Percent Due in Two Thousand Nineteen [Member] | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  |  |  |  |  |  |  |  | $ 413,000,000
Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  |  |  |  |  | $ 265,000,000 |  |  |
Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member] | Par Value [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 265,000,000 |
Senior Note Five Point Seven Five Percent Due in Two Thousand Twenty Three [Member] | Fair Value [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 284,000,000 |
Senior Note Two Point Eight due in Two Thousand Twenty Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  | 20.00% |  |  |  |  |  |  |  |  |  |  |
Senior Note Two Point Eight due in Two Thousand Twenty Nine [Member] | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  |
Senior Note Three Point Six due in Two Thousand Forty Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Senior Note Three Point Six due in Two Thousand Forty Nine [Member] | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |
Senior Note Five Point One Twenty Five due in Two Thousand Twenty Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid |  |  |  |  |  |  |  |  |  | $ 800 |  |  |

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