Segment Information Level 4 (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of company reporting segments				6
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 381	$ 388	$ 1,261	$ 416
Net Income (Loss) Attributable to Parent		381	388	1,261	416
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		3,852	3,861	11,493	11,480
Insurance Commissions and Fees		448	524	1,376	1,522
Net Investment Income (Loss)		730	810	2,335	2,402
Total Realized Investment Gains (Losses)		(44)	69	(30)	30
Other Income		24	29	66	85
Revenues		4,562	4,769	13,864	13,997
Premiums Earned, Net		3,404	3,337	10,117	9,958
Property and Casualty, Commercial Insurance Product Line [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		211	280	710	721
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		1,647	1,578	4,853	4,678
Property and Casualty, Personal Insurance Product Line [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		19	73	136	142
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income	[1]	977	964	2,895	2,838
Affinity Earned Premiums		797	772	2,300
Property & Casualty Other Operations [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		16	14	(72)	(108)
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		1
Revenues			0
Premiums Earned, Net				1	0
Group Insurance Policies [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		42	37	150	143
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		769	753	2,345	2,329
Mutual Funds [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		22	22	66	64
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		182	185	545	542
Talcott Resolution [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		74	28	402	(331)
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		275	379	848	1,084
Corporate Segment [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(3)	(66)	(131)	(215)
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Insurance Commissions and Fees		1	2	6	9
Non Proprietary [Member] | Mutual Funds [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		154	150	457	436
Accident and Health Insurance Product Line [Member] | Property and Casualty, Commercial Insurance Product Line [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		769	738	2,273	2,204
Accident and Health Insurance Product Line [Member] | Group Insurance Policies [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		361	357	1,106	1,091
Property Insurance Product Line [Member] | Property and Casualty, Commercial Insurance Product Line [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		158	142	474	415
Automobiles Commercial [Member] | Property and Casualty, Commercial Insurance Product Line [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		156	149	456	438
Package Business [Member] | Property and Casualty, Commercial Insurance Product Line [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		305	294	896	866
Liability [Member] | Property and Casualty, Commercial Insurance Product Line [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		146	144	423	435
Surety Product Line [Member] | Property and Casualty, Commercial Insurance Product Line [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		55	55	163	158
Professional Liability [Member] | Property and Casualty, Commercial Insurance Product Line [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		58	56	168	162
Automobiles Consumer [Member] | Property and Casualty, Personal Insurance Product Line [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		674	662	1,994	1,948
Homeowners [Member] | Property and Casualty, Personal Insurance Product Line [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		303	302	901	890
Life Insurance Product Line [Member] | Group Insurance Policies [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		365	354	1,106	1,113
Property & Casualty Other Operations [Member] | Group Insurance Policies [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		43	42	133	125
Proprietary [Member] | Mutual Funds [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Earned premiums and fee income		$ 28	$ 35	$ 88	$ 106

[1] [1]For the three months ended September 30, 2015 and 2014, AARP members accounted for earned premiums of $797 and $772, respectively.