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Segment Information - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Net investment income | $ 1,780 | $ 1,603 | $ 1,577
Property and Casualty, Commercial Insurance Product Line [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 997 | 949 | 917
Property and Casualty, Personal Insurance Product Line [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 155 | 141 | 135
Property & Casualty Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 90 | 106 | 127
Group Insurance Policies |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 474 | 381 | 366
Hartford Funds [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 5 | 3 | 1
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | $ 59 | $ 23 | $ 31

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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=114873790&loc=SL114874131-224263 + Details
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