Business Dispositions - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]			Net realized gains (losses)
Income tax expense	$ 584	$ 443	$ 534
Continental Europe Operations [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration			11
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			21
Income tax expense			5
HIG:DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAfterTax			$ 16
Business Combination, Contingent Consideration, Liability	$ 0