Investments and Derivative Instruments (Details Textual 4) (USD $) In Billions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Investments and Derivative Instruments [Abstract]
Concentration Risk, Benchmark Description	greater than 10% of the Company’s stockholder’s equity	greater than 10% of the Company’s stockholder’s equity
hig_CompanysLargestExposureToConcentrationOfCreditRiskWithASingleIssuer	$ 0.9	$ 1.1
hig_CompanysPercentageOfLargestExposureToStockholdersEquity	10.70%	10.10%
hig_CompanysPercentageOfLargestExposureToInvestedAssets	2.20%	1.60%