| **Accumulated Other Comprehensive Income (AOCI) (Details) - USD ($) $ in Millions** | 3 Months Ended |
|-------------------------------------------------------------------------------------|----------------|
||
| **AOCI, Net of Tax**                                                                |           |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                           | $ (435)        |   |
| AOCI, net of tax, end of period                                                     | (442)          |   |
| AOCI on Net Unrecognized Investment Gain (Loss)                                     |           |   |
| **AOCI, Before Tax**                                                                |           |   |
| AOCI, before tax, beginning of period                                               | (570)          | $ (847) |
| Other comprehensive income before reclassification, before tax                      | (65)           | 163 |
| Reclassification adjustment, before tax                                             | 10             | 0 |
| Effect on other comprehensive income, before tax                                    | (55)           | 163 |
| AOCI, before tax, end of period                                                     | (625)          | (684) |
| **AOCI, Tax**                                                                       |           |   |
| AOCI, tax, beginning of period                                                      | (123)          | (182) |
| Other comprehensive income before reclassification, tax                             | (13)           | 35 |
| Reclassification adjustment, tax                                                    | 2              | 0 |
| Effect on other comprehensive income, tax                                           | (11)           | 35 |
| AOCI, tax, end of period                                                            | (134)          | (147) |
| **AOCI, Net of Tax**                                                                |           |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                           | (447)          | (665) |
| Other comprehensive income before reclassification, net of tax                      | (52)           | 128 |
| Reclassification adjustment, net of tax                                             | 8              | 0 |
| Effect on other comprehensive income, net of tax                                    | (44)           | 128 |
| AOCI, net of tax, end of period                                                     | (491)          | (537) |
| AOCI on Pension Obligations                                                         |           |   |
| **AOCI, Before Tax**                                                                |           |   |
| AOCI, before tax, beginning of period                                               | 30             | 36 |
| Other comprehensive income before reclassification, before tax                      | 0              | (5) |
| Reclassification adjustment, before tax                                             | 0              | (1) |
| Effect on other comprehensive income, before tax                                    | 0              | (6) |
| AOCI, before tax, end of period                                                     | 30             | 30 |
| **AOCI, Tax**                                                                       |           |   |
| AOCI, tax, beginning of period                                                      | 8              | 9 |
| Other comprehensive income before reclassification, tax                             | 0              | (1) |
| Reclassification adjustment, tax                                                    | 0              | 0 |
| Effect on other comprehensive income, tax                                           | 0              | (1) |
| AOCI, tax, end of period                                                            | 8              | 8 |
| **AOCI, Net of Tax**                                                                |           |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                           | 22             | 27 |
| Other comprehensive income before reclassification, net of tax                      | 0              | (4) |
| Reclassification adjustment, net of tax                                             | 0              | (1) |
| Effect on other comprehensive income, net of tax                                    | 0              | (5) |
| AOCI, net of tax, end of period                                                     | 22             | 22 |
| AOCI on Life Policy Reserves, Reinsurance Recoverable And Other                     |           |   |
| **AOCI, Before Tax**                                                                |           |   |
| AOCI, before tax, beginning of period                                               | (13)           | 29 |
| Other comprehensive income before reclassification, before tax                      | 47             | (45) |
| Reclassification adjustment, before tax                                             | 0              | 0 |
| Effect on other comprehensive income, before tax                                    | 47             | (45) |
| AOCI, before tax, end of period                                                     | 34             | (16) |
| **AOCI, Tax**                                                                       |           |   |
| AOCI, tax, beginning of period                                                      | (3)            | 5 |
| Other comprehensive income before reclassification, tax                             | 10             | (9) |
| Reclassification adjustment, tax                                                    | 0              | 0 |
| Effect on other comprehensive income, tax                                           | 10             | (9) |
| AOCI, tax, end of period                                                            | 7              | (4) |
| **AOCI, Net of Tax**                                                                |           |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                           | (10)           | 24 |
| Other comprehensive income before reclassification, net of tax                      | 37             | (36) |
| Reclassification adjustment, net of tax                                             | 0              | 0 |
| Effect on other comprehensive income, net of tax                                    | 37             | (36) |
| AOCI, net of tax, end of period                                                     | 27             | (12) |
| Summary of AOCI                                                                     |           |   |
| **AOCI, Before Tax**                                                                |           |   |
| AOCI, before tax, beginning of period                                               | (553)          | (782) |
| Change in unrealized gains, net, on investments available for sale, before tax      | (55)           | 163 |
| Change in pension obligations, before tax                                           | 0              | (6) |
| Change in life policy reserves, reinsurance recoverable and other, before tax       | 47             | (45) |
| Effect on other comprehensive income, before tax                                    | (8)            | 112 |
| AOCI, before tax, end of period                                                     | (561)          | (670) |
| **AOCI, Tax**                                                                       |           |   |
| AOCI, tax, beginning of period                                                      | (118)          | (168) |
| Change in unrealized gains, net, on investments available for sale, tax             | (11)           | 35 |
| Change in pension obligations, tax                                                  | 0              | (1) |
| Change in Life Policy Reserves, Reinsurance Recoverable and Other, Tax              | 10             | (9) |
| Effect on other comprehensive income, tax                                           | (1)            | 25 |
| AOCI, tax, end of period                                                            | (119)          | (143) |
| **AOCI, Net of Tax**                                                                |           |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                           | (435)          | (614) |
| Change in unrealized gains, net, on investments available for sale, net of tax      | (44)           | 128 |
| Change in pension obligations, net of tax                                           | 0              | (5) |
| Change in Life Policy Reserves, Reinsurance Recoverable and Other, Net of Tax       | 37             | (36) |
| Effect on other comprehensive income, net of tax                                    | (7)            | 87 |
| AOCI, net of tax, end of period                                                     | $ (442)        | $ (527) |

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).
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Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.
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Amount before tax and reclassification adjustments of other comprehensive income (loss).
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Amount after tax, before reclassification adjustments of other comprehensive income (loss).
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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).
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Amount before tax of other comprehensive income (loss) attributable to parent entity.
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Amount after tax of other comprehensive income (loss) attributable to parent entity.
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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.
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| - Definition
Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.
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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.
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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.
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Amount before tax of reclassification adjustments of other comprehensive income (loss).
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Amount after tax of reclassification adjustments of other comprehensive income (loss).
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