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Segment Information - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Net investment income | $ 1,951 | $ 1,780 | $ 1,603
Property and Casualty, Commercial Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 1,129 | 997 | 949
Property and Casualty, Personal Insurance [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 179 | 155 | 141
Property & Casualty Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 84 | 90 | 106
Group Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 486 | 474 | 381
Hartford Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 7 | 5 | 3
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | $ 66 | $ 59 | $ 23

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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=116637232&loc=SL114874131-224263 + Details
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