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Goodwill & Other Intangible Assets - Goodwill Carrying Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Ending balance	$ 1,911,000,000	$ 1,911,000,000
Goodwill, Impairment Loss	0	0
Operating Segments \| P&C Commercial Lines
Goodwill [Roll Forward]
Ending balance	659,000,000	659,000,000
Operating Segments \| P&C Personal Lines
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 \| Group 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 \| Group Benefits [Member]
Goodwill [Roll Forward]
Ending balance	$ 138,000,000	$ 138,000,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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