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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

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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