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Business Dispositions - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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) Net realized gains (losses)
Income tax expense $ 443 $ 531 $ 383
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 14
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   21 48
HIG:DisposalGroupNotDiscontinuedOperationGainLossOnDisposalAfterTax   16 30
Business Combination, Contingent Consideration, Liability $ 0    
Gain (Loss) on Investments [Member] | 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]      
Income tax expense   $ 5 $ 18