Schedule III Supplementary Insurance Information Level 4 (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Schedule of Supplementary Insurance Information [Abstract]
Supplementary Insurance Information, Deferred Policy Acquisition Costs		$ 1,816	$ 1,823	[1]
Future Policy Benefits, Unpaid Losses and Loss Adjustment Expenses		41,572	41,444	[1]
Unearned Premiums		5,385	5,255	[1]
Other Policyholder Funds and Benefits Payable		31,670	32,532	[1]
Earned Premiums, Fee Income and Other		15,503	15,444		$ 15,611
Net Investment Income (Loss)		3,030	3,154		3,264
Benefits, Losses and Loss Adjustment Expenses		10,775	10,805		11,048
Amortization of Deferred Policy Acquisition Costs and Present Value of Future Profits		1,502	1,729		1,794
Net Written Premiums	[2]	10,578	10,244		9,929
Insurance Operating Costs and Other Expenses	[3]	4,122	4,381		6,360
Property & Casualty Commercial [Member]
Schedule of Supplementary Insurance Information [Abstract]
Supplementary Insurance Information, Deferred Policy Acquisition Costs		435	421	[1]
Future Policy Benefits, Unpaid Losses and Loss Adjustment Expenses		16,559	16,505	[1]
Unearned Premiums		3,271	3,184	[1]
Other Policyholder Funds and Benefits Payable		0	0	[1]
Earned Premiums, Fee Income and Other		6,598	6,402		6,315
Net Investment Income (Loss)		910	958		984
Benefits, Losses and Loss Adjustment Expenses		3,886	3,855		4,085
Amortization of Deferred Policy Acquisition Costs and Present Value of Future Profits		951	919		905
Net Written Premiums	[2]	6,625	6,381		6,208
Insurance Operating Costs and Other Expenses	[3]	1,260	1,194		1,190
Property and Casualty, Personal Insurance Product Line [Member]
Schedule of Supplementary Insurance Information [Abstract]
Supplementary Insurance Information, Deferred Policy Acquisition Costs		155	155	[1]
Future Policy Benefits, Unpaid Losses and Loss Adjustment Expenses		1,845	1,874	[1]
Unearned Premiums		1,959	1,914	[1]
Other Policyholder Funds and Benefits Payable		0	0	[1]
Earned Premiums, Fee Income and Other		3,873	3,806		3,823
Net Investment Income (Loss)		128	129		145
Benefits, Losses and Loss Adjustment Expenses		2,768	2,684		2,580
Amortization of Deferred Policy Acquisition Costs and Present Value of Future Profits		359	348		332
Net Written Premiums	[2]	3,918	3,861		3,719
Insurance Operating Costs and Other Expenses	[3]	609	599		761
Other Insurance Product Line [Member]
Schedule of Supplementary Insurance Information [Abstract]
Supplementary Insurance Information, Deferred Policy Acquisition Costs		0	0	[1]
Future Policy Benefits, Unpaid Losses and Loss Adjustment Expenses		3,421	3,427	[1]
Unearned Premiums		3	1	[1]
Other Policyholder Funds and Benefits Payable		0	0	[1]
Earned Premiums, Fee Income and Other		32	1		0
Net Investment Income (Loss)		133	129		141
Benefits, Losses and Loss Adjustment Expenses		243	261		148
Amortization of Deferred Policy Acquisition Costs and Present Value of Future Profits		0	0		0
Net Written Premiums	[2]	35	2		2
Insurance Operating Costs and Other Expenses	[3]	25	31		27
Group Benefits [Member]
Schedule of Supplementary Insurance Information [Abstract]
Supplementary Insurance Information, Deferred Policy Acquisition Costs		35	36	[1]
Future Policy Benefits, Unpaid Losses and Loss Adjustment Expenses		6,379	6,540	[1]
Unearned Premiums		43	45	[1]
Other Policyholder Funds and Benefits Payable		495	518	[1]
Earned Premiums, Fee Income and Other		3,136	3,095		3,330
Net Investment Income (Loss)		371	374		390
Benefits, Losses and Loss Adjustment Expenses		2,427	2,362		2,518
Amortization of Deferred Policy Acquisition Costs and Present Value of Future Profits		31	32		33
Net Written Premiums	[2]	0	0		0
Insurance Operating Costs and Other Expenses	[3]	788	836		964
Mutual Funds [Member]
Schedule of Supplementary Insurance Information [Abstract]
Supplementary Insurance Information, Deferred Policy Acquisition Costs		11	11	[1]
Future Policy Benefits, Unpaid Losses and Loss Adjustment Expenses		0	0	[1]
Unearned Premiums		0	0	[1]
Other Policyholder Funds and Benefits Payable		0	0	[1]
Earned Premiums, Fee Income and Other		723	723		668
Net Investment Income (Loss)		1	0		0
Benefits, Losses and Loss Adjustment Expenses		0	0		0
Amortization of Deferred Policy Acquisition Costs and Present Value of Future Profits		22	28		39
Net Written Premiums	[2]	0	0		0
Insurance Operating Costs and Other Expenses	[3]	568	559		511
Talcott Resolution [Member]
Schedule of Supplementary Insurance Information [Abstract]
Supplementary Insurance Information, Deferred Policy Acquisition Costs		1,180	1,200	[1]
Future Policy Benefits, Unpaid Losses and Loss Adjustment Expenses		13,368	13,098	[1]
Unearned Premiums		109	111	[1]
Other Policyholder Funds and Benefits Payable		31,175	32,014	[1]
Earned Premiums, Fee Income and Other		1,133	1,407		1,463	[4]
Net Investment Income (Loss)		1,470	1,542		1,577	[4]
Benefits, Losses and Loss Adjustment Expenses		1,451	1,643		1,717	[4]
Amortization of Deferred Policy Acquisition Costs and Present Value of Future Profits		139	402		485	[4]
Net Written Premiums	[2]	0	0		0	[4]
Insurance Operating Costs and Other Expenses	[3]	441	544		2,150	[4]
Corporate [Member]
Schedule of Supplementary Insurance Information [Abstract]
Supplementary Insurance Information, Deferred Policy Acquisition Costs		0	0	[1]
Future Policy Benefits, Unpaid Losses and Loss Adjustment Expenses		0	0	[1]
Unearned Premiums		0	0	[1]
Other Policyholder Funds and Benefits Payable		0	0	[1]
Earned Premiums, Fee Income and Other		8	10		12
Net Investment Income (Loss)		17	22		27
Benefits, Losses and Loss Adjustment Expenses		0	0		0
Amortization of Deferred Policy Acquisition Costs and Present Value of Future Profits		0	0		0
Net Written Premiums	[2]	0	0		0
Insurance Operating Costs and Other Expenses	[3]	$ 431	$ 618		$ 757

[1] SegmentDeferred PolicyAcquisition Costs Future Policy Benefits,Unpaid Losses and Loss Adjustment Expenses Unearned Premiums OtherPolicyholderFunds and Benefits Payable As of December 31, 2015 Commercial Lines$435$16,559$3,271$— Personal Lines1551,8451,959— Property & Casualty Other Operations—3,4213— Group Benefits356,37943495 Mutual Funds11——— Talcott Resolution1,18013,36810931,175 Corporate———— Consolidated$1,816$41,572$5,385$31,670 As of December 31, 2014 Commercial Lines$421$16,5053,184— Personal Lines1551,8741,914— Property & Casualty Other Operations—3,4271— Group Benefits366,54045518 Mutual Funds11——— Talcott Resolution1,20013,09811132,014 Corporate———— Consolidated$1,823$41,444$5,255$32,532

[2] Excludes life insurance pursuant to Regulation S-X.

[3] Includes interest expense, goodwill impairment, loss on extinguishment of debt, restructuring and other costs, and reinsurance loss on disposition.

[4] For the year ended, December 31, 2013, Talcott Resolution was recast to reflect the impact of the sale of HLIKK. For further information regarding this transaction, see Note 18 - Discontinued Operations and Business Dispositions of Notes to Consolidated Financial Statements.