Basis of Presentation and Accounting Policies Level 4 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jun. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance Commissions and Fees	$ 203	$ 231
Sale of HHI	On May 31, 2018 the Company's indirect parent, Hartford Holding, Inc. ("HHI") completed the sale of the Company's parent to a group of investors led by Cornell Capital LLC, Atlas Merchant Capital LLC, TRB Advisors LP, Global Atlantic Financial Group ("Global Atlantic"), Pine Brook and J. Safra Group. Although Talcott Resolution Life Insurance Company is no longer affiliated with The Hartford Financial Services Group, Inc. ("The Hartford") or any of its subsidiaries, The Hartford retained a 9.7 percent ownership interest in HHLP ("Talcott Resolution Sale Transaction").
Investments and Cash				$ 27,038
Present Value of Future Insurance Profits, Net	$ 741	0	$ 716	805	$ 0
Deferred Income Tax Assets, Net	876		969	998
Intangible Assets, Net (Excluding Goodwill)	50		51	55
Reinsurance Recoverables, Including Reinsurance Premium Paid	29,321		29,564	22,615
Separate Account Assets	104,809		98,814	110,773
Total assets	156,296		150,146	162,284
Liability for Future Policy Benefits	18,314		18,323	18,057
Policyholder Funds	28,182		28,584	29,560
Other Liabilities	2,602		2,420	2,127
Separate Accounts, Liability	104,809		98,814	110,773
Total liabilities	153,907		148,141	160,517
Stockholders' Equity Attributable to Parent	2,389	6,486	2,005	1,767	6,680
Total liabilities and stockholder's equity	156,296		150,146	$ 162,284
Accumulated Net Unrealized Investment Gain (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity Attributable to Parent	181	900	$ (173)		$ 1,022
Other fee revenues [Member] | Fee Income [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Insurance Commissions and Fees	$ 21	$ 25