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Segment Information Level 4 (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of company reporting segments			6
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss) Attributable to Parent	$ 234	$ 438	$ 572	$ 977
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	3,934	3,936	11,818	11,670
Net investment income	729	772	2,172	2,203
Realized Investment Gains (Losses)	(3)	(17)	52	(119)
Other Income	24	24	66	67
Total revenues	4,684	4,715	14,108	13,821
Commercial Lines [1]
Segment Reporting Information [Line Items]
Insurance Commissions and Fees	9	10	28	29
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss) Attributable to Parent	90	268	579	730
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	1,732	1,687	5,159	4,979
Commercial Lines [1] | Workers’ compensation
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	828	775	2,461	2,309
Commercial Lines [1] | Liability
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	150	156	450	447
Commercial Lines [1] | Package business
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	325	318	965	940
Commercial Lines [1] | Automobile
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	155	162	477	474
Commercial Lines [1] | Professional liability
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	63	58	183	166
Commercial Lines [1] | Bond
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	59	56	172	163
Commercial Lines [1] | Property
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	152	162	451	480
Personal Lines [1]
Segment Reporting Information [Line Items]
Insurance Commissions and Fees	0	0	0	0
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss) Attributable to Parent	8	33	65	6
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	932	990	2,818	2,960
Affinity Earned Premiums	801	825	2,400	2,400
Personal Lines [1] | Automobile
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	653	693	1,975	2,065
Personal Lines [1] | Homeowners
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	279	297	843	895
Other
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss) Attributable to Parent	18	31	62	(106)
Group Benefits
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss) Attributable to Parent	71	62	185	167
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	822	812	2,481	2,415
Group Benefits | Group disability
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	386	378	1,146	1,128
Group Benefits | Group life
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	383	383	1,176	1,134
Group Benefits | Other
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	53	51	159	153
Mutual Funds
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss) Attributable to Parent	26	21	73	61
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	203	178	595	517
Mutual Funds | Mutual Fund
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	179	153	522	442
Talcott Resolution
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss) Attributable to Parent	80	78	253	199
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	245	268	763	796
Talcott Resolution | Talcott
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	24	25	73	75
Corporate
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss) Attributable to Parent	(59)	(55)	(645)	(80)
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	$ 0	1	$ 2	3
Reclass from Commercial Lines to Personal Lines [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Other Income		$ 4		$ 0

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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