Schedule II Condensed Financial Information of The Hartford Financial Services Group, Inc. Level 4 Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Operations and Comprehensive Income
Net Investment Income									$ 3,030	$ 3,154	$ 3,264
Realized Investment Gains (Losses)									(156)	16	1,798
Revenues	$ 4,513	$ 4,562	$ 4,685	$ 4,617	$ 4,617	$ 4,769	$ 4,616	$ 4,612	18,377	18,614	20,673
Interest Expense									357	376	397
Benefits, Losses and Expenses	$ 4,009	$ 4,183	$ 4,215	$ 3,992	$ 4,173	$ 4,273	$ 4,466	$ 4,003	16,399	16,915	19,202
Income Tax Expense (Benefit)									305	350	246
Net Income (Loss) Attributable to Parent									1,682	798	176
Other Comprehensive Income (Loss), Net of Tax									(1,257)	1,007	(2,922)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									425	1,805	(2,746)
Parent Company [Member]
Consolidated Statements of Operations and Comprehensive Income
Net Investment Income									14	11	10
Realized Investment Gains (Losses)									(6)	(6)	(7)
Revenues									8	5	3
Interest Expense									346	365	384
Other Cost and Expense, Operating									35	134	178
Benefits, Losses and Expenses									381	499	562
Operating Income (Loss)									(373)	(494)	(559)
Income Tax Expense (Benefit)									(131)	(172)	(187)
Loss Before Earnings Losses of Subsidiaries									(242)	(322)	(372)
Income (Loss) from Subsidiaries, Net of Tax									1,924	1,120	548
Net Income (Loss) Attributable to Parent									1,682	798	176
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax									0	0	(11)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax									(1)	10	(13)
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Net of Tax									(82)	(292)	127
Other Comprehensive Income (Loss), Before Other Comprehensive Income of Subsidiaries, Net of Tax									(83)	(282)	103
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest									$ 1,174	$ (1,289)	$ 3,025