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Segment Information - Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Earned premiums and fee income	$ 19,487	$ 18,565	$ 18,224
Total net investment income	2,313	1,846	1,951
Net realized gains (losses)	509	(14)	395
Other revenues	81	126	170
Revenues	22,390	20,523	20,740
P&C Personal Lines | AARP Members
Segment Reporting Information [Line Items]
Earned premiums and fee income	2,700	2,800	2,900
Corporate
Segment Reporting Information [Line Items]
Earned premiums and fee income	50	58	60
Total net investment income	24	22	66
Operating Segments | P&C Commercial Lines
Segment Reporting Information [Line Items]
Earned premiums and fee income	9,575	8,940	8,325
Total net investment income	1,502	1,160	1,129
Operating Segments | P&C Commercial Lines | Workers’ compensation
Segment Reporting Information [Line Items]
Earned premiums and fee income	3,172	3,034	3,314
Operating Segments | P&C Commercial Lines | Liability
Segment Reporting Information [Line Items]
Earned premiums and fee income	1,622	1,401	1,064
Operating Segments | P&C Commercial Lines | Marine [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income	228	251	147
Operating Segments | P&C Commercial Lines | Package business
Segment Reporting Information [Line Items]
Earned premiums and fee income	1,665	1,540	1,471
Operating Segments | P&C Commercial Lines | Property
Segment Reporting Information [Line Items]
Earned premiums and fee income	829	793	728
Operating Segments | P&C Commercial Lines | Professional liability
Segment Reporting Information [Line Items]
Earned premiums and fee income	655	595	447
Operating Segments | P&C Commercial Lines | Bond
Segment Reporting Information [Line Items]
Earned premiums and fee income	287	274	261
Operating Segments | P&C Commercial Lines | Assumed Reinsurance [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income	328	298	180
Operating Segments | P&C Commercial Lines | Automobile
Segment Reporting Information [Line Items]
Earned premiums and fee income	789	754	713
Operating Segments | P&C Personal Lines
Segment Reporting Information [Line Items]
Earned premiums and fee income	2,986	3,042	3,235
Total net investment income	157	157	179
Operating Segments | P&C Personal Lines | Property
Segment Reporting Information [Line Items]
Earned premiums and fee income	927	961	987
Operating Segments | P&C Personal Lines | Automobile
Segment Reporting Information [Line Items]
Earned premiums and fee income	2,059	2,081	2,248
Operating Segments | Property & Casualty Other Operations
Segment Reporting Information [Line Items]
Earned premiums and fee income	0	0	2
Total net investment income	75	55	84
Operating Segments | Group Benefits [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income	5,687	5,536	5,603
Total net investment income	550	448	486
Operating Segments | Group Benefits [Member] | Group disability
Segment Reporting Information [Line Items]
Earned premiums and fee income	2,983	2,832	2,828
Operating Segments | Group Benefits [Member] | Group life
Segment Reporting Information [Line Items]
Earned premiums and fee income	2,388	2,434	2,521
Operating Segments | Group Benefits [Member] | Other
Segment Reporting Information [Line Items]
Earned premiums and fee income	316	270	254
Operating Segments | Hartford Funds
Segment Reporting Information [Line Items]
Earned premiums and fee income	1,189	989	999
Total net investment income	5	4	7
Operating Segments | Hartford Funds | Third party retail customers [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income	1,094	903	907
Operating Segments | Hartford Funds | Talcott Resolution [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income	$ 95	$ 86	$ 92

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