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Goodwill & Other Intangible Assets - Goodwill Carrying Value (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Goodwill [Roll Forward] |  |
Ending balance | $ 1,911,000,000 | $ 1,911,000,000
Goodwill, Impairment Loss | 0 | 0
Operating Segments | P&C Business Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Ending balance | 659,000,000 | 659,000,000
Operating Segments | P&C Personal Insurance [Member] |  |
Goodwill [Roll Forward] |  |
Ending balance | 119,000,000 | 119,000,000
Operating Segments | Hartford Funds |  |
Goodwill [Roll Forward] |  |
Ending balance | 180,000,000 | 180,000,000
Operating Segments | Employee Benefits [Member] |  |
Goodwill [Roll Forward] |  |
Ending balance | 723,000,000 | 723,000,000
Corporate |  |
Goodwill [Roll Forward] |  |
Ending balance | 230,000,000 | 230,000,000
Corporate | Hartford Funds |  |
Goodwill [Roll Forward] |  |
Ending balance | 92,000,000 | 92,000,000
Corporate | Employee Benefits [Member] |  |
Goodwill [Roll Forward] |  |
Ending balance | $ 138,000,000 | $ 138,000,000

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