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Segment Information - Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net investment income	$ 1,846	$ 1,951	$ 1,780
Operating Segments | P&C Commercial Lines
Segment Reporting Information [Line Items]
Net investment income	1,160	1,129	997
Operating Segments | P&C Personal Lines
Segment Reporting Information [Line Items]
Net investment income	157	179	155
Operating Segments | Property & Casualty Other Operations
Segment Reporting Information [Line Items]
Net investment income	55	84	90
Operating Segments | Group Benefits [Member]
Segment Reporting Information [Line Items]
Net investment income	448	486	474
Operating Segments | Hartford Funds
Segment Reporting Information [Line Items]
Net investment income	4	7	5
Corporate
Segment Reporting Information [Line Items]
Net investment income	$ 22	$ 66	$ 59

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 http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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