SCHEDULE I - CONSOLIDATED SUMMARY OF INVESTMENTS (Details) $ in Millions	Dec. 31, 2019 USD ($)
Summary of investments, other than investments in related parties [Line Items]
Cost	$ 119,722
Carrying Value	131,658
Fixed Maturity Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	93,307	[1]
Fair Value	103,773	[1]
Carrying Value	103,773	[1]
Equity Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	123
Fair Value	103
Carrying Value	103
Other Liabilities [Member]
Summary of investments, other than investments in related parties [Line Items]
Derivative Liabilities	238
U.S. Government Bonds [Member] | Fixed Maturity Securities [Member] | Bonds [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	355	[1]
Fair Value	403	[1]
Carrying Value	403	[1]
Foreign Government Bonds [Member] | Fixed Maturity Securities [Member] | Bonds [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	326	[1]
Fair Value	388	[1]
Carrying Value	388	[1]
State And Municipal Bonds [Member] | Fixed Maturity Securities [Member] | Bonds [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	4,605	[1]
Fair Value	5,685	[1]
Carrying Value	5,685	[1]
Public Utilities [Member] | Fixed Maturity Securities [Member] | Bonds [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	13,066	[1]
Fair Value	14,842	[1]
Carrying Value	14,842	[1]
Public Utilities [Member] | Equity Securities [Member] | Common Stock [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	5
Fair Value	4
Carrying Value	4
All other corporate bonds [Member] | Fixed Maturity Securities [Member] | Bonds [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	65,809	[1]
Fair Value	72,937	[1]
Carrying Value	72,937	[1]
Mortgage-Backed And Asset-Backed Securities [Member] | Fixed Maturity Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	8,661	[1]
Fair Value	8,974	[1]
Carrying Value	8,974	[1]
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	485	[1]
Fair Value	544	[1]
Carrying Value	544	[1]
Banks, Trusts, And Insurance Companies [Member] | Equity Securities [Member] | Common Stock [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	35
Fair Value	35
Carrying Value	35
Industrial, miscellaneous and all other [Member] | Equity Securities [Member] | Common Stock [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	35
Fair Value	26
Carrying Value	26
Nonredeemable preferred securities [Member] | Equity Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	48
Fair Value	38
Carrying Value	38
Trading Securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	4,268
Fair Value	4,602
Carrying Value	4,602
Mortgage Loans On Real Estate [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	16,244
Fair Value	16,774
Carrying Value	16,244
Real estate [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	11
Carrying Value	11
Policy loans [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	2,460
Carrying Value	2,460
Derivative Investments [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	755	[2]
Fair Value	1,911	[2]
Carrying Value	1,911	[2]
Other Investments [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	2,554
Fair Value	2,554
Carrying Value	$ 2,554

[1] 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.

[2] Derivative investment assets were offset by $238 million in derivative liabilities reflected in other liabilities on our Consolidated Balance Sheets.