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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Fee income | $ 1,488 | $ 1,277 | $ 1,301
Other Income | 81 | 126 | 170
Revenue from Contract with Customer, Excluding Assessed Tax | 1,569 | 1,360 | 1,404
Installment billing fees [Member] | Operating Segments | P&C Commercial Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Fee income | 34 | 30 | 35
Installment billing fees [Member] | Operating Segments | P&C Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Fee income | 32 | 34 | 37
Insurance servicing fees [Member] | Operating Segments | P&C Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Other Income | 80 | 81 | 83
Administrative services fees [Member] | Operating Segments | Group Benefits [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Fee income | 183 | 175 | 180
Advisor, distribution and other management fees [Member] | Operating Segments | Hartford Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Fee income | 1,086 | 901 | 911
Other fees [Member] | Operating Segments | Hartford Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Fee income | 103 | 88 | 88
Investment management and other fees [Member] | Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Fee income | 50 | 49 | 50
Transition service fees [Member] | Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Other Income | $ 1 | $ 2 | $ 20

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