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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

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- 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 + Details
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