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Segment Information - Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net investment income	$ 2,177	$ 2,313	$ 1,846
Operating Segments | P&C Commercial Lines
Segment Reporting Information [Line Items]
Net investment income	1,415	1,502	1,160
Operating Segments | P&C Personal Lines
Segment Reporting Information [Line Items]
Net investment income	140	157	157
Operating Segments | Property & Casualty Other Operations
Segment Reporting Information [Line Items]
Net investment income	63	75	55
Operating Segments | Group Benefits [Member]
Segment Reporting Information [Line Items]
Net investment income	524	550	448
Operating Segments | Hartford Funds
Segment Reporting Information [Line Items]
Net investment income	9	5	4
Corporate
Segment Reporting Information [Line Items]
Net investment income	$ 26	$ 24	$ 22

X

- Definition

Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(2))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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