| **Accumulated Other Comprehensive Income (AOCI) (Details) - USD ($) $ in Millions**      | 3 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------------------------|----------------|----------------|
||
| **AOCI, Net of Tax**                                                                     |           |           |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                |           |           | $ (614) |   |
| AOCI, net of tax, end of period                                                          | $ (827)        |           | (827) |   |
| AOCI on Net Unrecognized Investment Gain (Loss)                                          |           |           |   |   |
| **AOCI, Before Tax**                                                                     |           |           |   |   |
| AOCI, before tax, beginning of period                                                    | (838)          | $ (564)        | (847) | $ 792 |
| Other comprehensive income before reclassification, before tax                           | (369)          | (514)          | (364) | (1,867) |
| Reclassification adjustment, before tax                                                  | 0              | 0              | 4 | (3) |
| Effect on other comprehensive income, before tax                                         | (369)          | (514)          | (360) | (1,870) |
| AOCI, before tax, end of period                                                          | (1,207)        | (1,078)        | (1,207) | (1,078) |
| **AOCI, Tax**                                                                            |           |           |   |   |
| AOCI, tax, beginning of period                                                           | (179)          | (119)          | (182) | 165 |
| Other comprehensive income before reclassification, tax                                  | (79)           | (109)          | (77) | (392) |
| Reclassification adjustment, tax                                                         | 0              | 0              | 1 | (1) |
| Effect on other comprehensive income, tax                                                | (79)           | (109)          | (76) | (393) |
| AOCI, tax, end of period                                                                 | (258)          | (228)          | (258) | (228) |
| **AOCI, Net of Tax**                                                                     |           |           |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                | (659)          | (445)          | (665) | 627 |
| Other comprehensive income before reclassification, net of tax                           | (290)          | (405)          | (287) | (1,475) |
| Reclassification adjustment, net of tax                                                  | 0              | 0              | 3 | (2) |
| Effect on other comprehensive income, net of tax                                         | (290)          | (405)          | (284) | (1,477) |
| AOCI, net of tax, end of period                                                          | (949)          | (850)          | (949) | (850) |
| AOCI on Pension Obligations                                                              |           |           |   |   |
| **AOCI, Before Tax**                                                                     |           |           |   |   |
| AOCI, before tax, beginning of period                                                    | 29             | 27             | 36 | 27 |
| Other comprehensive income before reclassification, before tax                           | 0              | 0              | (5) | 0 |
| Reclassification adjustment, before tax                                                  | 0              | 0              | (2) | 0 |
| Effect on other comprehensive income, before tax                                         | 0              | 0              | (7) | 0 |
| AOCI, before tax, end of period                                                          | 29             | 27             | 29 | 27 |
| **AOCI, Tax**                                                                            |           |           |   |   |
| AOCI, tax, beginning of period                                                           | 7              | 7              | 9 | 7 |
| Other comprehensive income before reclassification, tax                                  | 0              | 0              | (2) | 0 |
| Reclassification adjustment, tax                                                         | 0              | 0              | 0 | 0 |
| Effect on other comprehensive income, tax                                                | 0              | 0              | (2) | 0 |
| AOCI, tax, end of period                                                                 | 7              | 7              | 7 | 7 |
| **AOCI, Net of Tax**                                                                     |           |           |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                | 22             | 20             | 27 | 20 |
| Other comprehensive income before reclassification, net of tax                           | 0              | 0              | (3) | 0 |
| Reclassification adjustment, net of tax                                                  | 0              | 0              | (2) | 0 |
| Effect on other comprehensive income, net of tax                                         | 0              | 0              | (5) | 0 |
| AOCI, net of tax, end of period                                                          | 22             | 20             | 22 | 20 |
| AOCI on Life Policy Reserves, Reinsurance Recoverable And Other                          |           |           |   |   |
| **AOCI, Before Tax**                                                                     |           |           |   |   |
| AOCI, before tax, beginning of period                                                    | 13             | (67)           | 29 | (444) |
| Other comprehensive income before reclassification, before tax                           | 111            | 120            | 95 | 497 |
| Reclassification adjustment, before tax                                                  | 0              | 0              | 0 | 0 |
| Effect on other comprehensive income, before tax                                         | 111            | 120            | 95 | 497 |
| AOCI, before tax, end of period                                                          | 124            | 53             | 124 | 53 |
| **AOCI, Tax**                                                                            |           |           |   |   |
| AOCI, tax, beginning of period                                                           | 2              | (14)           | 5 | (93) |
| Other comprehensive income before reclassification, tax                                  | 22             | 25             | 19 | 104 |
| Reclassification adjustment, tax                                                         | 0              | 0              | 0 | 0 |
| Effect on other comprehensive income, tax                                                | 22             | 25             | 19 | 104 |
| AOCI, tax, end of period                                                                 | 24             | 11             | 24 | 11 |
| **AOCI, Net of Tax**                                                                     |           |           |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                | 11             | (53)           | 24 | (351) |
| Other comprehensive income before reclassification, net of tax                           | 89             | 95             | 76 | 393 |
| Reclassification adjustment, net of tax                                                  | 0              | 0              | 0 | 0 |
| Effect on other comprehensive income, net of tax                                         | 89             | 95             | 76 | 393 |
| AOCI, net of tax, end of period                                                          | 100            | 42             | 100 | 42 |
| Summary of AOCI                                                                          |           |           |   |   |
| **AOCI, Before Tax**                                                                     |           |           |   |   |
| AOCI, before tax, beginning of period                                                    | (796)          | (604)          | (782) | 375 |
| Change in unrealized gains, net, on investments available for sale, before tax           | (369)          | (514)          | (360) | (1,870) |
| Change in pension obligations, before tax                                                | 0              | 0              | (7) | 0 |
| Change in life policy reserves, reinsurance recoverable and other, before tax            | 111            | 120            | 95 | 497 |
| Effect on other comprehensive income, before tax                                         | (258)          | (394)          | (272) | (1,373) |
| AOCI, before tax, end of period                                                          | (1,054)        | (998)          | (1,054) | (998) |
| **AOCI, Tax**                                                                            |           |           |   |   |
| AOCI, tax, beginning of period                                                           | (170)          | (126)          | (168) | 79 |
| Change in unrealized gains, net, on investments available for sale, tax                  | (79)           | (109)          | (76) | (393) |
| Change in pension obligations, tax                                                       | 0              | 0              | (2) | 0 |
| Change in Life Policy Reserves, Reinsurance Recoverable and Other, Tax                   | 22             | 25             | 19 | 104 |
| Effect on other comprehensive income, tax                                                | (57)           | (84)           | (59) | (289) |
| AOCI, tax, end of period                                                                 | (227)          | (210)          | (227) | (210) |
| **AOCI, Net of Tax**                                                                     |           |           |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                | (626)          | (478)          | (614) | 296 |
| Change in unrealized gains, net, on investments available for sale, net of tax           | (290)          | (405)          | (284) | (1,477) |
| Change in pension obligations, net of tax                                                | 0              | 0              | (5) | 0 |
| Change in Life Policy Reserves, Reinsurance Recoverable and Other, Net of Tax            | 89             | 95             | 76 | 393 |
| Effect on other comprehensive income, net of tax                                         | (201)          | (310)          | (213) | (1,084) |
| AOCI, net of tax, end of period                                                          | $ (827)        | $ (788)        | (827) | (788) |
| As originally reported | AOCI on Life Policy Reserves, Reinsurance Recoverable And Other |           |           |   |   |
| **AOCI, Before Tax**                                                                     |           |           |   |   |
| AOCI, before tax, beginning of period                                                    |           |           | 29 | 1 |
| **AOCI, Tax**                                                                            |           |           |   |   |
| AOCI, tax, beginning of period                                                           |           |           | 5 | 0 |
| **AOCI, Net of Tax**                                                                     |           |           |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                |           |           | 24 | 1 |
| As originally reported | Summary of AOCI                                                 |           |           |   |   |
| **AOCI, Before Tax**                                                                     |           |           |   |   |
| AOCI, before tax, beginning of period                                                    |           |           | (782) | 820 |
| **AOCI, Tax**                                                                            |           |           |   |   |
| AOCI, tax, beginning of period                                                           |           |           | (168) | 172 |
| **AOCI, Net of Tax**                                                                     |           |           |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                |           |           | (614) | 648 |
| As adjusted | AOCI on Life Policy Reserves, Reinsurance Recoverable And Other            |           |           |   |   |
| **AOCI, Before Tax**                                                                     |           |           |   |   |
| AOCI, before tax, beginning of period                                                    |           |           | 0 | (445) |
| **AOCI, Tax**                                                                            |           |           |   |   |
| AOCI, tax, beginning of period                                                           |           |           | 0 | (93) |
| **AOCI, Net of Tax**                                                                     |           |           |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                |           |           | 0 | (352) |
| As adjusted | Summary of AOCI                                                            |           |           |   |   |
| **AOCI, Before Tax**                                                                     |           |           |   |   |
| AOCI, before tax, beginning of period                                                    |           |           | 0 | (445) |
| **AOCI, Tax**                                                                            |           |           |   |   |
| AOCI, tax, beginning of period                                                           |           |           | 0 | (93) |
| **AOCI, Net of Tax**                                                                     |           |           |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                |           |           | $ 0 | $ (352) |

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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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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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