| **Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions**                                               | 3 Months Ended |         |         |
|----------------------------------------------------------------------------------------------------------------------------|----------------|---------|---------|
||
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    | $ (527)        |    | $ (614) |   |
| Accumulated other comprehensive income, net of tax, end of period                                                          | (527)          |    |    |   |
| Accumulated Net Unrealized Investment Gain (Loss)                                                                          |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Other comprehensive income before reclassification, before tax                                                             | 163            | $ (743) |    |   |
| Reclassification adjustment, before tax                                                                                    | 0              | (3)     |    |   |
| Effect on other comprehensive income, before tax                                                                           | 163            | (746)   |    |   |
| Accumulated other comprehensive income, before tax, end of period                                                          | (684)          | 46      |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Other comprehensive income before reclassification, tax                                                                    | 35             | (157)   |    |   |
| Reclassification adjustment, tax                                                                                           | 0              | 0       |    |   |
| Effect on other comprehensive income, tax                                                                                  | 35             | (157)   |    |   |
| Accumulated other comprehensive income, tax, end of period                                                                 | (147)          | 8       |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    | (537)          | 38      |    |   |
| Other comprehensive income before reclassification, net of tax                                                             | 128            | (586)   |    |   |
| Reclassification adjustment, net of tax                                                                                    | 0              | (3)     |    |   |
| Effect on other comprehensive income, net of tax                                                                           | 128            | (589)   |    |   |
| Accumulated other comprehensive income, net of tax, end of period                                                          | (537)          | 38      |    |   |
| Accumulated Defined Benefit Plans Adjustment                                                                               |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Accumulated other comprehensive income, before tax, beginning of period                                                    | 36             | 27      |    |   |
| Other comprehensive income before reclassification, before tax                                                             | (5)            | 0       |    |   |
| Reclassification adjustment, before tax                                                                                    | (1)            | 0       |    |   |
| Effect on other comprehensive income, before tax                                                                           | (6)            | 0       |    |   |
| Accumulated other comprehensive income, before tax, end of period                                                          | 30             | 27      |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Accumulated other comprehensive income, tax, beginning of period                                                           | 9              | 7       |    |   |
| Other comprehensive income before reclassification, tax                                                                    | (1)            | 0       |    |   |
| Reclassification adjustment, tax                                                                                           | 0              | 0       |    |   |
| Effect on other comprehensive income, tax                                                                                  | (1)            | 0       |    |   |
| Accumulated other comprehensive income, tax, end of period                                                                 | 8              | 7       |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    | 22             | 20      | 27      | $ 20 |
| Other comprehensive income before reclassification, net of tax                                                             | (4)            | 0       |    |   |
| Reclassification adjustment, net of tax                                                                                    | (1)            | 0       |    |   |
| Effect on other comprehensive income, net of tax                                                                           | (5)            | 0       |    |   |
| Accumulated other comprehensive income, net of tax, end of period                                                          | 22             | 20      |    |   |
| Accumulated Net Unrealized Gain (Loss) on Life Policy Reserves, Reinsurance Recoverable And Other                          |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Accumulated other comprehensive income, before tax, beginning of period                                                    | 29             | (444)   |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Accumulated other comprehensive income, tax, beginning of period                                                           | 5              | (93)    |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    |           |    | 24      | (351) |
| Accumulated Net Unrealized Gain (Loss) on Life Policy Reserves, Reinsurance Recoverable And Other                          |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Other comprehensive income before reclassification, before tax                                                             | (45)           | 196     |    |   |
| Reclassification adjustment, before tax                                                                                    | 0              | 0       |    |   |
| Effect on other comprehensive income, before tax                                                                           | (45)           | 196     |    |   |
| Accumulated other comprehensive income, before tax, end of period                                                          | (16)           | (248)   |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Other comprehensive income before reclassification, tax                                                                    | (9)            | 41      |    |   |
| Reclassification adjustment, tax                                                                                           | 0              | 0       |    |   |
| Effect on other comprehensive income, tax                                                                                  | (9)            | 41      |    |   |
| Accumulated other comprehensive income, tax, end of period                                                                 | (4)            | (52)    |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    | (12)           | (196)   |    |   |
| Other comprehensive income before reclassification, net of tax                                                             | (36)           | 155     |    |   |
| Reclassification adjustment, net of tax                                                                                    | 0              | 0       |    |   |
| Effect on other comprehensive income, net of tax                                                                           | (36)           | 155     |    |   |
| Accumulated other comprehensive income, net of tax, end of period                                                          | (12)           | (196)   |    |   |
| Accumulated Other Comprehensive Income (Loss)                                                                              |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Accumulated other comprehensive income, before tax, beginning of period                                                    | (782)          | 375     |    |   |
| Change in unrealized gains, net, on investments available for sale, before tax                                             | 163            | (746)   |    |   |
| Change in pension obligations, before tax                                                                                  | (6)            | 0       |    |   |
| Change in Life Policy Reserves, Reinsurance Recoverable and Other                                                          | (45)           | 196     |    |   |
| Effect on other comprehensive income, before tax                                                                           | 112            | (550)   |    |   |
| Accumulated other comprehensive income, before tax, end of period                                                          | (670)          | (175)   |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Accumulated other comprehensive income, tax, beginning of period                                                           | (168)          | 79      |    |   |
| Change in unrealized gains, net, on investments available for sale, tax                                                    | 35             | (157)   |    |   |
| Change in pension obligations, tax                                                                                         | (1)            | 0       |    |   |
| Change in Life Policy Reserves, Reinsurance Recoverable and Other, Tax                                                     | (9)            | 41      |    |   |
| Effect on other comprehensive income, tax                                                                                  | 25             | (116)   |    |   |
| Accumulated other comprehensive income, tax, end of period                                                                 | (143)          | (37)    |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    | (527)          | (138)   | (614)   | 296 |
| Change in unrealized gains, net, on investments available for sale, net of tax                                             | 128            | (589)   |    |   |
| Change in pension obligations, net of tax                                                                                  | (5)            | 0       |    |   |
| Change in Life Policy Reserves, Reinsurance Recoverable and Other, Net of Tax                                              | (36)           | 155     |    |   |
| Effect on other comprehensive income, net of tax                                                                           | 87             | (434)   |    |   |
| Accumulated other comprehensive income, net of tax, end of period                                                          | (527)          | (138)   |    |   |
| As originally reported | Accumulated Net Unrealized Investment Gain (Loss)                                                 |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Accumulated other comprehensive income, before tax, beginning of period                                                    | (847)          | 792     |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Accumulated other comprehensive income, tax, beginning of period                                                           | (182)          | 165     |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    |           |    | (665)   | 627 |
| As originally reported | Accumulated Net Unrealized Gain (Loss) on Life Policy Reserves, Reinsurance Recoverable And Other |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Accumulated other comprehensive income, before tax, beginning of period                                                    | 29             | 1       |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Accumulated other comprehensive income, tax, beginning of period                                                           | 5              | 0       |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    |           |    | 24      | 1 |
| As originally reported | Accumulated Other Comprehensive Income (Loss)                                                     |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Accumulated other comprehensive income, before tax, beginning of period                                                    | (782)          | 820     |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Accumulated other comprehensive income, tax, beginning of period                                                           | (168)          | 172     |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    |           |    | (614)   | 648 |
| As adjusted | Accumulated Net Unrealized Gain (Loss) on Life Policy Reserves, Reinsurance Recoverable And Other            |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Accumulated other comprehensive income, before tax, beginning of period                                                    | 0              | (445)   |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Accumulated other comprehensive income, tax, beginning of period                                                           | 0              | (93)    |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    |           |    | 0       | (352) |
| As adjusted | Accumulated Other Comprehensive Income (Loss)                                                                |           |    |    |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                      |           |    |    |   |
| Accumulated other comprehensive income, before tax, beginning of period                                                    | 0              | (445)   |    |   |
| **Accumulated Other Comprehensive Income (Loss), Tax [Abstract]**                                                          |           |    |    |   |
| Accumulated other comprehensive income, tax, beginning of period                                                           | $ 0            | $ (93)  |    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                   |           |    |    |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                    |           |    | $ 0     | $ (352) |

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Other Comprehensive Income (Loss), Available-for-sale Securities and Other Assets Adjustment, before Tax
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Other Comprehensive Income (Loss), Available-for-sale Securities and Other Assets Adjustment, Net of Tax
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Other Comprehensive Income (Loss), Life Policy Reserves, Reinsurance Recoverable and Other, Net of Tax
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| - Definition
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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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount after tax, before reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).
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| - Definition
Amount before tax of other comprehensive income (loss) attributable to parent entity.
+ References
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| - Definition
Amount after tax of other comprehensive income (loss) attributable to parent entity.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of reclassification adjustments of other comprehensive income (loss).
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
+ References
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