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Segment Information Level 4 (Details) $ in Millions	3 Months Ended								12 Months Ended
Segment Information Level 4 (Details) $ in Millions	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments									6
Deferred Policy Acquisition Cost, Amortization Expense									$ 1,502	$ 1,571	$ 1,593
Earned premiums and fee income									15,521	15,416	15,332
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Insurance Commissions and Fees									1,710	1,839	1,996
Total net investment income									2,961	3,030	3,154
Net realized capital losses									(268)	(156)	16
Other revenues									86	87	112
Segments, Geographical Areas [Abstract]
Revenues	$ 4,537	$ 4,695	$ 4,677	$ 4,391	$ 4,513	$ 4,562	$ 4,685	$ 4,617	18,300	18,377	18,614
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(81)	$ 438	$ 216	$ 323	421	$ 381	$ 413	$ 467	896	1,682	798
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Income Tax Expense (Benefit)									(92)	305	350
Assets by Segment [Abstract]
Assets	223,432				228,348				223,432	228,348
Amortization of deferred policy acquisition costs and present value of future profits									(1,523)	(1,502)	(1,729)
Available-for-sale Securities [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total net investment income									2,961	3,030	3,153
Equity Securities [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Total net investment income									0	0	1
Property & Casualty Commercial [Member]
Segment Reporting Information [Line Items]
Deferred Policy Acquisition Cost, Amortization Expense									973	951	919
Earned premiums and fee income									6,651	6,511	6,289
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									1,007	1,003	983
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Income Tax Expense (Benefit)									422	409	385
Assets by Segment [Abstract]
Assets	29,141				28,388				29,141	28,388
Property and Casualty, Personal Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Deferred Policy Acquisition Cost, Amortization Expense									348	359	348
Earned premiums and fee income									3,898	3,873	3,806
Segment Information (Textual) [Abstract]
AARP earned premiums									3,300	3,200	3,000
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(22)	187	207
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Income Tax Expense (Benefit)									(30)	82	92
Assets by Segment [Abstract]
Assets	6,083				6,147				6,083	6,147
Other Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									0	32	1
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(529)	(53)	(108)
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Income Tax Expense (Benefit)									(355)	(47)	(51)
Assets by Segment [Abstract]
Assets	4,732				4,562				4,732	4,562
Group Insurance Policies [Member]
Segment Reporting Information [Line Items]
Deferred Policy Acquisition Cost, Amortization Expense									31	31	32
Earned premiums and fee income									3,223	3,136	3,095
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									230	187	191
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Income Tax Expense (Benefit)									83	63	63
Assets by Segment [Abstract]
Assets	9,405				9,666				9,405	9,666
Mutual Funds [Member]
Segment Reporting Information [Line Items]
Deferred Policy Acquisition Cost, Amortization Expense									24	22	28
Earned premiums and fee income									701	723	723
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									78	86	87
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Income Tax Expense (Benefit)									43	48	49
Assets by Segment [Abstract]
Assets	480				449				480	449
Talcott Resolution [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									1,044	1,133	1,407
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									244	430	(187)
Talcott Resolution [Member]
Segment Reporting Information [Line Items]
Deferred Policy Acquisition Cost, Amortization Expense									147	139	402
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Income Tax Expense (Benefit)									54	(17)	16
Assets by Segment [Abstract]
Assets	170,327				175,319				170,327	175,319
Corporate [Member]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Insurance Commissions and Fees									4	8	11
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(112)	(158)	(375)
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Income Tax Expense (Benefit)									(309)	(233)	(204)
Assets by Segment [Abstract]
Assets	$ 3,264				$ 3,817				3,264	3,817
Fixed Equity and other mutual fund investments [Member] \| Mutual Funds [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									601	607	586
Homeowners [Member] \| Property and Casualty, Personal Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									1,178	1,202	1,193
Disability Insurance Policy [Member] \| Group Insurance Policies [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									1,506	1,479	1,450
Automobiles Consumer [Member] \| Property and Casualty, Personal Insurance Product Line [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									2,720	2,671	2,613
Surety Product Line [Member] \| Property & Casualty Commercial [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									218	218	210
Package Business [Member] \| Property & Casualty Commercial [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									1,229	1,203	1,163
Automobiles Commercial [Member] \| Property & Casualty Commercial [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									640	614	591
Accident and Health Insurance Product Line [Member] \| Property & Casualty Commercial [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									3,174	3,051	2,971
General Liability [Member] \| Property & Casualty Commercial [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									585	567	582
Property Insurance Product Line [Member] \| Property & Casualty Commercial [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									575	637	559
Other Insurance Product Line [Member] \| Group Insurance Policies [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									205	180	167
Life Insurance Product Line [Member] \| Group Insurance Policies [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									1,512	1,477	1,478
Investments Product Line [Member] \| Mutual Funds [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									100	116	137
Professional Liability [Member] \| Property & Casualty Commercial [Member]
Segment Reporting Information [Line Items]
Earned premiums and fee income									$ 230	$ 221	$ 213