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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Insurance Commissions and Fees | $ 333 | $ 319
Other revenues | 19 | 20
Non-insurance revenues with customers | 352 | 338
Installment billing fees [Member] | Operating Segments [Member] | Commercial Lines |  |
Segment Reporting Information [Line Items] |  |
Insurance Commissions and Fees | 11 | 10
Installment billing fees [Member] | Operating Segments [Member] | Personal Lines |  |
Segment Reporting Information [Line Items] |  |
Insurance Commissions and Fees | 8 | 8
Insurance servicing revenues | Operating Segments [Member] | Personal Lines |  |
Segment Reporting Information [Line Items] |  |
Other revenues | 19 | 19
Administrative services | Operating Segments [Member] | Group Benefits |  |
Segment Reporting Information [Line Items] |  |
Insurance Commissions and Fees | 54 | 51
Advisor, distribution and other management fees | Operating Segments [Member] | Hartford Funds |  |
Segment Reporting Information [Line Items] |  |
Insurance Commissions and Fees | 250 | 241
Investment management and other fees | Corporate |  |
Segment Reporting Information [Line Items] |  |
Insurance Commissions and Fees | $ 10 | $ 9

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