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SCHEDULE I - CONSOLIDATED SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Summary of investments, other than investments in related parties [Line Items] |  |
Cost | $ 105,671 |
Carrying Value | 113,089 |
Trading securities [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 1,425 |
Fair Value | 1,620 |
Carrying Value | 1,620 |
Mortgage Loans On Real Estate [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 10,762 |
Fair Value | 10,877 |
Carrying Value | 10,762 |
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 | 2,399 |
Carrying Value | 2,399 |
Derivative instruments [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 1,538 | [1]
Fair Value | 915 | [1]
Carrying Value | 915 | [1]
Derivative Liabilities | 338 |
Other investments [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 2,296 |
Fair Value | 2,296 |
Carrying Value | 2,296 |
Fixed maturity AFS securities [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 86,993 | [2]
Fair Value | 94,840 | [2]
Carrying Value | 94,840 | [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 | 5,623 |
Fair Value | 5,847 |
Carrying Value | 5,847 |
Fixed maturity AFS securities [Member] | Hybrid and redeemable preferred securities [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 575 | [2]
Fair Value | 640 | [2]
Carrying Value | 640 | [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 | 527 | [2]
Fair Value | 567 | [2]
Carrying Value | 567 | [2]
Fixed maturity AFS securities [Member] | Bonds [Member] | Foreign governments [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 395 | [2]
Fair Value | 451 | [2]
Carrying Value | 451 | [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 | 4,172 | [2]
Fair Value | 5,119 | [2]
Carrying Value | 5,119 | [2]
Fixed maturity AFS securities [Member] | Bonds [Member] | Public utilities [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 12,785 | [2]
Fair Value | 14,244 | [2]
Carrying Value | 14,244 | [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 | 62,916 | [2]
Fair Value | 67,972 | [2]
Carrying Value | 67,972 | [2]
Equity AFS securities [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 247 | [2]
Fair Value | 246 | [2]
Carrying Value | 246 | [2]
Equity AFS securities [Member] | Nonredeemable preferred securities [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 19 | [2]
Fair Value | 25 | [2]
Carrying Value | 25 | [2]
Equity AFS securities [Member] | Common Stock [Member] | Banks, trusts, and insurance companies [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 184 | [2]
Fair Value | 188 | [2]
Carrying Value | 188 | [2]
Equity AFS securities [Member] | Common Stock [Member] | Industrial, miscellaneous and all other [Member] |  |
Summary of investments, other than investments in related parties [Line Items] |  |
Cost | 44 | [2]
Fair Value | 33 | [2]
Carrying Value | $ 33 | [2]
[1] | Derivative investment assets were offset by $338 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.

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