SCHEDULE I - CONSOLIDATED SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) $ in Millions	Dec. 31, 2015 USD ($)
Summary of investments, other than investments in related parties [Line Items]
Cost	$ 99,217
Carrying Value	102,208
Trading securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	1,653
Fair Value	1,854
Carrying Value	1,854
Mortgage loans on real estate [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	8,678
Fair Value	8,936
Carrying Value	8,678
Real estate [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	17
Carrying Value	17
Policy loans [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	2,545
Carrying Value	2,545
Derivative instruments [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	1,731	[1]
Fair Value	1,537	[1]
Carrying Value	1,537	[1]
Derivative Liabilities	69
Other Investments [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	1,778
Fair Value	1,778
Carrying Value	1,778
Fixed maturity AFS securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	82,589	[2]
Fair Value	85,562	[2]
Carrying Value	85,562	[2]
Fixed maturity AFS securities [Member] | Hybrid and redeemable preferred securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	762	[2]
Fair Value	806	[2]
Carrying Value	806	[2]
Fixed maturity AFS securities [Member] | Variable interest entities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	596	[2]
Fair Value	598	[2]
Carrying Value	598	[2]
Equity AFS securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	226	[2]
Fair Value	237	[2]
Carrying Value	237	[2]
Bonds | Fixed maturity AFS securities [Member] | U.S. government and government agencies and authorities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	386	[2]
Fair Value	429	[2]
Carrying Value	429	[2]
Bonds | Fixed maturity AFS securities [Member] | ABS [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	1,652	[2]
Fair Value	1,688	[2]
Carrying Value	1,688	[2]
Bonds | Fixed maturity AFS securities [Member] | State and municipal bonds [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	3,821	[2]
Fair Value	4,480	[2]
Carrying Value	4,480	[2]
Bonds | Fixed maturity AFS securities [Member] | MBS
Summary of investments, other than investments in related parties [Line Items]
Cost	3,930	[2]
Fair Value	4,104	[2]
Carrying Value	4,104	[2]
Bonds | Fixed maturity AFS securities [Member] | Foreign governments [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	465	[2]
Fair Value	524	[2]
Carrying Value	524	[2]
Bonds | Fixed maturity AFS securities [Member] | Public utilities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	11,922	[2]
Fair Value	12,653	[2]
Carrying Value	12,653	[2]
Bonds | Fixed maturity AFS securities [Member] | All other corporate bonds [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	59,055	[2]
Fair Value	60,280	[2]
Carrying Value	60,280	[2]
Common Stock | Equity AFS securities [Member] | Banks, trusts, and insurance companies [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	173	[2]
Fair Value	171	[2]
Carrying Value	171	[2]
Common Stock | Equity AFS securities [Member] | Industrial, miscellaneous and all other [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	3	[2]
Fair Value	2	[2]
Carrying Value	2	[2]
Common Stock | Equity AFS securities [Member] | Nonredeemable preferred securities [Member]
Summary of investments, other than investments in related parties [Line Items]
Cost	50	[2]
Fair Value	64	[2]
Carrying Value	$ 64	[2]

[1] Derivative investment assets were offset by $69 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.