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Employee Benefit Plans - Investment and Savings Plan, Additional Information (Details) - USD ($)	12 Months Ended
	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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Defined Contribution Plan, Fair Value of Plan Assets

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Defined Contribution Plan, Maximum Asset Allocation of Plan Sponsor Shares

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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

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Percentage employer matches of the employee's percentage contribution matched.

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Maximum amount the employee may contribute to a defined contribution plan.

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