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Employee Benefit Plans - Investment and Savings Plan, Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement Benefits [Abstract] |  |  |
Maximum percentage of plan assets that can be in the common stock of Hartford | 10.00% |  |
Non-elective contribution percent | 2.00% |  |
Percent of employer matching contribution | 6.00% |  |
Limit of employee compensation annually | $ 1,000,000 |  |
Total cost to company related to Investment and Savings Plan | 113,000,000 | $ 115,000,000 | $ 117,000,000
Total assets | $ 540,000,000 | $ 438,000,000 |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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