Basis of Presentation and Accounting Policies Level 4 (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	On January 1, 2016 the Company adopted new consolidation guidance issued by the Financial Accounting Standards Board ("FASB"). The updates revise when to consolidate variable interest entities ("VIEs") and general partners’ investments in limited partnerships, end the deferral granted for applying the VIE guidance to certain investment companies, and reduce the number of circumstances where a decision maker’s or service provider’s fee arrangement is deemed to be a variable interest in an entity. The updates also modify guidance for determining whether limited partnerships are VIEs or voting interest entities.
Dividends	$ 750
Reinsurer Concentration Risk [Member] | Stockholders' Equity, Total [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration Risk, Percentage	0.00%
HIG_Accounting Standards Update 2020 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	In June 2016, the FASB issued updated guidance for recognition and measurement of credit losses on financial instruments. The new guidance will replace the “incurred loss” approach with an “expected loss” model for recognizing credit losses for instruments carried at other than fair value, which will initially result in the recognition of greater allowances for losses. The allowance will be an estimate of credit losses expected over the life of debt instruments, such as mortgage loans, reinsurance recoverables and receivables. Credit losses on available-for-sale (“AFS”) debt securities carried at fair value will continue to be measured as other-than-temporary impairments (“OTTI”) when incurred; however, the losses will be recognized through an allowance and no longer as an adjustment to the cost basis. Recoveries of OTTI will be recognized as reversals of valuation allowances and no longer accreted as investment income through an adjustment to the investment yield. The allowance on AFS securities cannot cause the net carrying value to be below fair value and, therefore, it is possible that increases in fair value due to decreases in market interest rates could cause the reversal of a valuation allowance and increase net income. The new guidance will also require purchased financial assets with a more-than-insignificant amount of credit deterioration since original issuance to be recorded based on contractual amounts due and an initial allowance recorded at the date of purchase. The guidance is effective January 1, 2020 through a cumulative-effect adjustment to retained earnings for the change in the allowance for credit losses for debt instruments carried at other than fair value. No allowance will be recognized at adoption for AFS debt securities; rather, their cost basis will be evaluated for an allowance for OTTI prospectively. Early adoption is permitted as of January 1, 2019. The Company has not yet determined the timing for adoption or estimated the effect on the Company’s Condensed Consolidated Financial Statements.