Schedule II Condensed Financial Information of the Hartford Financial Services, Inc. - Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Operations and Comprehensive Income
Net investment income									$ 1,951	$ 1,780	$ 1,603
Net realized capital gains (losses)									395	(112)	165
Total revenues	$ 5,361	$ 5,347	$ 5,092	$ 4,940	$ 4,633	$ 4,842	$ 4,789	$ 4,691	20,740	18,955	17,162
Interest expense									259	298	316
Loss on extinguishment of debt									(90)	(6)	0
Total benefits, losses and expenses	4,685	4,694	4,636	4,165	4,466	4,312	4,252	4,172	18,180	17,202	16,439
Income tax expense									475	268	985
Net income (loss)	$ 548	$ 535	$ 372	$ 630	$ 196	$ 432	$ 582	$ 597	2,085	1,807	(3,131)
Other comprehensive income (loss) - parent company:
Comprehensive income (loss)									3,716	(430)	(2,131)
Parent Company
Consolidated Statements of Operations and Comprehensive Income
Net investment income									50	41	15
Net realized capital gains (losses)									3	37	(1)
Total revenues									53	78	14
Interest expense									255	298	316
Loss on extinguishment of debt									(68)	(6)	0
Pension settlement									0	0	(750)
Other expense (income)									15	(6)	1
Total benefits, losses and expenses									338	298	1,067
Loss before income taxes and earnings of subsidiaries									(285)	(220)	(1,053)
Income tax expense									(60)	(630)	106
Income (loss) before earnings of subsidiaries									(225)	410	(1,159)
Earnings of subsidiaries									2,310	1,397	(1,972)
Net income (loss)									2,085	1,807	(3,131)
Other comprehensive income (loss) - parent company:
Change in net gain/loss on cash-flow hedging instruments									(24)	8	2
Change in net unrealized gain/loss on securities									5	(271)	280
Change in pension and other postretirement plan adjustments									(35)	(26)	107
Other comprehensive income (loss), net of taxes before other comprehensive income of subsidiaries									(54)	(289)	389
Other comprehensive income (loss) of subsidiaries									1,685	(1,948)	611
Total other comprehensive income (loss)									1,631	(2,237)	1,000
Comprehensive income (loss)									$ 3,716	$ (430)	$ (2,131)