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Restructuring and Related Activities (Details) - USD ($) $ in Millions | 12 Months Ended | 54 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2024
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other costs | $ 2 | $ 6 | $ 13 |
Hartford Next Program |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other costs | 2 | 6 | 13 | $ 127
Payments for Restructuring | (2) | (13) |  |
Restructuring and Related Cost, Expected Cost | 127 |  |  | 127
Hartford Next Program | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other costs | 0 | (6) | (7) | 35
Payments for Restructuring | 0 | (1) |  |
Restructuring Reserve, Period Increase (Decrease) |  | 6 | 7 |
Restructuring and Related Cost, Expected Cost | 35 |  |  | 35
Hartford Next Program | Information Technology |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other costs | 0 | 5 | 8 | 25
Payments for Restructuring | 0 | (5) |  |
Restructuring and Related Cost, Expected Cost | 25 |  |  | 25
Hartford Next Program | Professional fees and other expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and other costs | 2 | 7 | 12 | 67
Payments for Restructuring | (2) | (7) |  |
Restructuring and Related Cost, Expected Cost | 67 |  |  | 67
Hartford Next Program | Other liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 0 | 0 | 7 | 0
Hartford Next Program | Other liabilities | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 0 | 0 | 7 | 0
Hartford Next Program | Other liabilities | Information Technology |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 0 | 0 | 0 | 0
Hartford Next Program | Other liabilities | Professional fees and other expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | $ 0 | $ 0 | $ 0 | $ 0

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