SCHEDULE I - CONSOLIDATED SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) $ in Millions	Dec. 31, 2018 USD ($)
Summary of investments, other than investments in related parties [Line Items]
Cost	$ 112,870
Carrying Value	115,216
Trading Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	1,823
Fair Value	1,950
Carrying Value	1,950
Mortgage Loans On Real Estate [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	13,260
Fair Value	13,092
Carrying Value	13,260
Real estate [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	12
Carrying Value	12
Policy loans [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	2,509
Carrying Value	2,509
Derivative Instruments [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	466	[1]
Fair Value	1,107	[1]
Carrying Value	1,107	[1]
Other investments [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	2,255
Fair Value	2,255
Carrying Value	2,255
Fixed Maturity AFS Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	92,429	[2]
Fair Value	94,024	[2]
Carrying Value	94,024	[2]
Fixed Maturity AFS Securities [Member] | Mortgage-Backed And Asset-Backed Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	6,781	[2]
Fair Value	6,873	[2]
Carrying Value	6,873	[2]
Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	582	[2]
Fair Value	593	[2]
Carrying Value	593	[2]
Fixed Maturity AFS Securities [Member] | Bonds [Member] | U.S. government and government agencies and authorities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	390	[2]
Fair Value	417	[2]
Carrying Value	417	[2]
Fixed Maturity AFS Securities [Member] | Bonds [Member] | Foreign governments [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	406	[2]
Fair Value	448	[2]
Carrying Value	448	[2]
Fixed Maturity AFS Securities [Member] | Bonds [Member] | State And Municipal Bonds [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	4,647	[2]
Fair Value	5,345	[2]
Carrying Value	5,345	[2]
Fixed Maturity AFS Securities [Member] | Bonds [Member] | Public utilities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	13,330	[2]
Fair Value	13,773	[2]
Carrying Value	13,773	[2]
Fixed Maturity AFS Securities [Member] | Bonds [Member] | All other corporate bonds [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	66,293	[2]
Fair Value	66,575	[2]
Carrying Value	66,575	[2]
Equity Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	116
Fair Value	99
Carrying Value	99
Equity Securities [Member] | Nonredeemable preferred securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	21
Fair Value	20
Carrying Value	20
Equity Securities [Member] | Common Stock [Member] | Banks, trusts, and insurance companies [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	59
Fair Value	54
Carrying Value	54
Equity Securities [Member] | Common Stock [Member] | Industrial, miscellaneous and all other [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	36
Fair Value	25
Carrying Value	25
Parent Company [Member]
Summary of investments, other than investments in related parties [Line Items]
Derivative Liabilities	$ 160

[1] Derivative investment assets were offset by $160 million in derivative liabilities reflected in other liabilities on our Consolidated Balance Sheets.

[2] Investments deemed to have declines in value that are other-than-temporary are written down or reserved for to reduce the carrying value to their estimated realizable value.