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Segment Information - Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Earned premiums and fee income									$ 17,182	$ 15,309	$ 14,738
Total net investment income									1,780	1,603	1,577
Net realized capital gains (losses)									(112)	165	(110)
Other revenues									105	85	86
Total revenues	$ 4,633	$ 4,842	$ 4,789	$ 4,691	$ 4,587	$ 4,192	$ 4,214	$ 4,169	18,955	17,162	16,291
Operating Expense [Member]
Segment Reporting Information [Line Items]
Distribution Costs										188	184
Property and Casualty, Commercial Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									7,081	6,902	6,690
Total net investment income									997	949	917
Property and Casualty, Commercial Insurance Product Line [Member] | Workers’ compensation
Segment Reporting Information [Line Items]
Earned premiums and fee income									3,341	3,287	3,187
Property and Casualty, Commercial Insurance Product Line [Member] | Liability
Segment Reporting Information [Line Items]
Earned premiums and fee income									653	604	585
Property and Casualty, Commercial Insurance Product Line [Member] | Package business
Segment Reporting Information [Line Items]
Earned premiums and fee income									1,364	1,301	1,249
Property and Casualty, Commercial Insurance Product Line [Member] | Property
Segment Reporting Information [Line Items]
Earned premiums and fee income									618	604	577
Property and Casualty, Commercial Insurance Product Line [Member] | Professional liability
Segment Reporting Information [Line Items]
Earned premiums and fee income									254	246	231
Property and Casualty, Commercial Insurance Product Line [Member] | Bond
Segment Reporting Information [Line Items]
Earned premiums and fee income									241	230	218
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile
Segment Reporting Information [Line Items]
Earned premiums and fee income									610	630	643
Property and Casualty, Personal Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									3,439	3,734	3,937
Total net investment income									155	141	135
Property and Casualty, Personal Insurance Product Line [Member] | AARP Members
Segment Reporting Information [Line Items]
Earned premiums and fee income									3,000	3,200	3,300
Property and Casualty, Personal Insurance Product Line [Member] | Property
Segment Reporting Information [Line Items]
Earned premiums and fee income									1,041	1,117	1,188
Property and Casualty, Personal Insurance Product Line [Member] | Automobile
Segment Reporting Information [Line Items]
Earned premiums and fee income									2,398	2,617	2,749
Property & Casualty Other Operations
Segment Reporting Information [Line Items]
Earned premiums and fee income									0	0	0
Total net investment income									90	106	127
Group Insurance Policies
Segment Reporting Information [Line Items]
Earned premiums and fee income									5,598	3,677	3,223
Total net investment income									474	381	366
Group Insurance Policies | Group disability
Segment Reporting Information [Line Items]
Earned premiums and fee income									2,746	1,718	1,506
Group Insurance Policies | Group life
Segment Reporting Information [Line Items]
Earned premiums and fee income									2,611	1,745	1,512
Group Insurance Policies | Other
Segment Reporting Information [Line Items]
Earned premiums and fee income									241	214	205
Hartford Funds [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									1,032	992	885
Total net investment income									5	3	1
Hartford Funds [Member] | Third party retail customers [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									932	888	779
Hartford Funds [Member] | Talcott Resolution [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									100	104	106
Corporate
Segment Reporting Information [Line Items]
Earned premiums and fee income									32	4	3
Total net investment income									$ 59	$ 23	$ 31

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