| **Accumulated Other Comprehensive Income (Details) (USD $)In Millions, unless otherwise specified**                                            | 3 Months Ended | 9 Months Ended |         |         |         |         |
|------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|---------|---------|---------|---------|
||
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                                       |           |           |    |    |    |    |   |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                                        | $ 1,267        |           | $ 1,267 |    |    | $ 1,129 |   |   |
| Accumulated other comprehensive income, net of tax, end of period                                                                              | 1,267          |           | 1,267   |    |    | 1,129   |   |   |
| Accumulated Net Unrealized Investment Gain (Loss)                                                                                              |           |           |    |    |    |    |   |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                                          |           |           |    |    |    |    |   |   |
| Accumulated unrealized gains, net, on investments available for sale, before tax, beginning of period                                          | 1,987          | 1,664          | 1,875   | 1,489   |    |    |   |   |
| Other comprehensive income before reclassification, before tax                                                                                 | 82             | 262            | 246     | 456     |    |    |   |   |
| Reclassification adjustment for realized gains, net, included in net income, before tax                                                        | (20)           | (9)            | (72)    | (28)    |    |    |   |   |
| Effect on other comprehensive income, before tax                                                                                               | 62             | 253            | 174     | 428     |    |    |   |   |
| Accumulated unrealized gains, net, on investments available for sale, before tax, end of period                                                | 2,049          | 1,917          | 2,049   | 1,917   |    |    |   |   |
| **Accumulated Other Comprehensive Income Loss Tax [Abstract]**                                                                                 |           |           |    |    |    |    |   |   |
| Accumulated unrealized gains, net, on investments available for sale and other invested assets, tax, beginning of period                       | 708            | 662            | 708     | 662     |    |    |   |   |
| Other comprehensive income before reclassification, tax                                                                                        | 29             | 93             | 85      | 160     |    |    |   |   |
| Reclassification adjustment for realized gains, net, included in net income, tax                                                               | (7)            | (4)            | (24)    | (10)    |    |    |   |   |
| Effect on other comprehensive income, tax                                                                                                      | 22             | 89             | 61      | 150     |    |    |   |   |
| Accumulated unrealized gains, net, on investments available for sale and other invested assets, tax, end of period                             | 686            | 573            | 647     | 512     |    |    |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                                       |           |           |    |    |    |    |   |   |
| Accumulated unrealized gains, net, on investments available for sale and other invested assets, net of tax, beginning of period                | 1,301          | 1,091          | 1,228   | 977     |    |    |   |   |
| Other comprehensive income before reclassification , net of tax                                                                                | 53             | 169            | 161     | 296     |    |    |   |   |
| Reclassification adjustment for realized gains, net, included in net income, net of tax                                                        | (13)           | (5)            | (48)    | (18)    |    |    |   |   |
| Effect on other comprehensive income, net of tax                                                                                               | 40             | 164            | 113     | 278     |    |    |   |   |
| Accumulated unrealized gains, net, on investments available for sale and other invested assets, net of tax, end of period                      | 1,341          | 1,255          | 1,341   | 1,255   |    |    |   |   |
| Accumulated Defined Benefit Plans Adjustment                                                                                                   |           |           |    |    |    |    |   |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                                          |           |           |    |    |    |    |   |   |
| Other comprehensive income before reclassification, before tax                                                                                 | 0              | 0              |    |    |    |    |   |   |
| Accumulated unrealized losses, net, for pension obligations, before Tax, beginning of period                                                   | (96)           | (85)           | (101)   | (88)    |    |    |   |   |
| Reclassification adjustment for amortization of actuarial loss and prior service cost, net, included in net income, before tax                 | 2              | 2              |    |    |    |    |   |   |
| Effect on other comprehensive income, before tax                                                                                               | 2              | 2              | 7       | 5       |    |    |   |   |
| Accumulated unrealized losses, net, for pension obligations, before Tax, end of period                                                         | (94)           | (83)           | (94)    | (83)    |    |    |   |   |
| **Accumulated Other Comprehensive Income Loss Tax [Abstract]**                                                                                 |           |           |    |    |    |    |   |   |
| Other comprehensive income before reclassification, tax                                                                                        | 0              | 0              |    |    |    |    |   |   |
| Accumulated unrealized losses, net, for pension obligations, tax, beginning of period                                                          | (33)           | (30)           | (35)    | (31)    |    |    |   |   |
| Reclassification adjustment for amortization of actuarial loss and prior service cost, net, included in net income, tax                        | 1              | 1              |    |    |    |    |   |   |
| Effect on other comprehensive income, tax                                                                                                      | 1              | 1              | 3       | 2       |    |    |   |   |
| Accumulated unrealized losses, net, for pension obligations, tax, end of period                                                                | (32)           | (29)           | (32)    | (29)    |    |    |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                                       |           |           |    |    |    |    |   |   |
| Other comprehensive income before reclassification , net of tax                                                                                | 0              | 0              |    |    |    |    |   |   |
| Accumulated unrealized losses, net, for pension obligations, net of tax, beginning of period                                                   | (63)           | (55)           | (66)    | (57)    |    |    |   |   |
| Reclassification adjustment for amortization of actuarial loss and prior service cost,net, included in net income, net of tax                  | 1              | 1              |    |    |    |    |   |   |
| Effect on other comprehensive income, net of tax                                                                                               | 1              | 1              | 4       | 3       |    |    |   |   |
| Accumulated unrealized losses, net, for pension obligations, net of tax, end of period                                                         | (62)           | (54)           | (62)    | (54)    |    |    |   |   |
| Accumulated Net Unrealized Gain (Loss) on Deferred Costs, Reserves And Other                                                                   |           |           |    |    |    |    |   |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                                          |           |           |    |    |    |    |   |   |
| Other comprehensive income before reclassification, before tax                                                                                 | 9              | (5)            | 36      | (15)    |    |    |   |   |
| Other Comprehensive Income (Loss), Reclassification Adjustment for Life Deferred Acquisition Costs, Life Policy Reserves and Other, Before Tax | (2)            | (1)            | (5)     | (1)     |    |    |   |   |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, before tax, beginning of period        | (26)           | (39)           | (50)    | (29)    |    |    |   |   |
| Effect on other comprehensive income, before tax                                                                                               | 7              | (6)            | 31      | (16)    |    |    |   |   |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, before tax, end of period              | (19)           | (45)           | (19)    | (45)    |    |    |   |   |
| **Accumulated Other Comprehensive Income Loss Tax [Abstract]**                                                                                 |           |           |    |    |    |    |   |   |
| Other comprehensive income before reclassification, tax                                                                                        | 2              | (2)            | 12      | (5)     |    |    |   |   |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, tax, beginning of period               | (9)            | (13)           | (17)    | (10)    |    |    |   |   |
| Other Comprehensive Income (Loss), Reclassification Adjustment for Life Deferred Acquisition Costs, Life Policy Reserves and Other, Tax        | 0              | 0              | (2)     | 0       |    |    |   |   |
| Effect on other comprehensive income, tax                                                                                                      | 2              | (2)            | 10      | (5)     |    |    |   |   |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, tax, end of period                     | (7)            | (15)           | (7)     | (15)    |    |    |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                                       |           |           |    |    |    |    |   |   |
| Other comprehensive income before reclassification , net of tax                                                                                | 7              | (3)            | 24      | (10)    |    |    |   |   |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, beginning of period, net of tax        | (17)           | (26)           | (33)    | (19)    |    |    |   |   |
| Other Comprehensive Income (Loss), Reclassification Adjustment for Life Deferred Acquisition Costs, Life Policy Reserves and Other, Net of Tax | (2)            | (1)            | (3)     | (1)     |    |    |   |   |
| Effect on other comprehensive income, net of tax                                                                                               | 5              | (4)            | 21      | (11)    |    |    |   |   |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, end of period, net of tax              | (12)           | (30)           | (12)    | (30)    |    |    |   |   |
| Accumulated Other Comprehensive Income (Loss)                                                                                                  |           |           |    |    |    |    |   |   |
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                                          |           |           |    |    |    |    |   |   |
| Accumulated other comprehensive income, before taxes, beginning of period                                                                      | 1,865          | 1,540          | 1,724   | 1,372   |    |    |   |   |
| Change in unrealized gains, net, on investments available for sale, before Tax                                                                 | 62             | 253            | 174     | 428     |    |    |   |   |
| Change in pension obligations, before tax                                                                                                      | 2              | 2              | 7       | 5       |    |    |   |   |
| Change in life deferred acquisition costs, life policy reserves and other, before Tax                                                          | 7              | (6)            | 31      | (16)    |    |    |   |   |
| Effect on other comprehensive income, before Tax                                                                                               | 71             | 249            | 212     | 417     |    |    |   |   |
| Accumulated other comprehensive income, before taxes, end of period                                                                            | 1,936          | 1,789          | 1,936   | 1,789   |    |    |   |   |
| **Accumulated Other Comprehensive Income Loss Tax [Abstract]**                                                                                 |           |           |    |    |    |    |   |   |
| Accumulated other comprehensive income, tax, beginning of period                                                                               | 644            | 530            | 595     | 471     |    |    |   |   |
| Change in unrealized gains, net, on investments available for sale and other invested assets, tax                                              | 22             | 89             | 61      | 150     |    |    |   |   |
| Change in pension obligations, tax                                                                                                             | 1              | 1              | 3       | 2       |    |    |   |   |
| Change in life deferred acquisition costs, life policy reserves and other, tax                                                                 | 2              | (2)            | 10      | (5)     |    |    |   |   |
| Effect on other comprehensive income, tax                                                                                                      | 25             | 88             | 74      | 147     |    |    |   |   |
| Accumulated other comprehensive income, tax, end of period                                                                                     | 669            | 618            | 669     | 618     |    |    |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                                       |           |           |    |    |    |    |   |   |
| Accumulated other comprehensive income, net of tax, beginning of period                                                                        | 1,267          | 1,171          | 1,267   | 1,171   | 1,221   | 1,129   | 1,010 | 901 |
| Change in unrealized gains, net, on investments available for sale, net of tax                                                                 | 40             | 164            | 113     | 278     |    |    |   |   |
| Change in pension obligations, net of tax                                                                                                      | 1              | 1              | 4       | 3       |    |    |   |   |
| Change in life deferred acquisition costs, life policy reserves and other, net of tax                                                          | 5              | (4)            | 21      | (11)    |    |    |   |   |
| Effect on other comprehensive income, net of tax                                                                                               | 46             | 161            | 138     | 270     |    |    |   |   |
| Accumulated other comprehensive income, net of tax, end of period                                                                              | $ 1,267        | $ 1,171        | $ 1,267 | $ 1,171 | $ 1,221 | $ 1,129 | $ 1,010 | $ 901 |

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No definition available.
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Accumulated Other Comprehensive Income (Loss), Before Taxes
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The tax effect from the total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.
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Accumulated Other Comprehensive Income (Loss), Tax
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No definition available.
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Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Net of Tax
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No definition available.
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Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Tax
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Accumulated Other Comprehensive Income (Loss), Unrealized Gains (Losses) on Available for sale Securities, Before Tax
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Accumulated Other Comprehensive Income (Loss), Unrealized Gains (Losses) on Available for sale Securities, Net of Tax
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No definition available.
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Accumulated Other Comprehensive Income (Loss), Unrealized Gains Losses On Life Deferred Acquisition Costs And Life Policy Reserves And Other, before Tax
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No definition available.
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Increase (Decrease) in Other Comprehensive Income (Loss), before Tax
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No definition available.
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Increase (Decrease) in Other Comprehensive Income (Loss), Net of Tax
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Other Comprehensive Income (Loss),Amortization of Actuarial Loss and Prior Service Cost Adjustment, Before Tax, Period Increase (Decrease)
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No definition available.
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Other Comprehensive Income (Loss),Amortization of Actuarial Loss and Prior Service Cost Adjustment, Net of Tax, Period Increase (Decrease)
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Other Comprehensive Income (Loss),Amortization of Actuarial Loss and Prior Service Cost Adjustment, Tax, Period Increase (Decrease)
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Other Comprehensive Income (Loss), Available For Sale Securities Adjustment, Before Tax, Period Increase (Decrease)
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No definition available.
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Other Comprehensive Income (Loss), Available For Sale Securities Adjustment, Net of Tax, Period Increase (Decrease)
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Other Comprehensive Income (Loss), Available For Sale Securities Adjustment, Tax
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No definition available.
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Other Comprehensive Income (Loss), Available-for-sale Securities and Other Assets Adjustment, before Tax
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No definition available.
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Other Comprehensive Income (Loss), Available-for-sale Securities and Other Assets Adjustment, Net of Tax
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No definition available.
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Other Comprehensive Income (Loss), Available-for-sale Securities and Other Assets Adjustment, Tax
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No definition available.
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No definition available.
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| - Definition
Other Comprehensive Income (Loss), Deferred Acquisition Costs, Life Policy Reserves and Other Adjustment, before Tax
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No definition available.
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Other Comprehensive Income (Loss), Deferred Acquisition Costs, Life Policy Reserves and Other Adjustment, Net of Tax
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No definition available.
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Other Comprehensive Income (Loss), Deferred Acquisition Costs, Life Policy Reserves and Other Adjustment, Tax
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No definition available.
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| - Definition
Other Comprehensive Income (Loss), Deferred Acquistion Costs And Life Policy Reserves And Other, Adjustment Before Tax Period Increase Decrease
+ References
No definition available.
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Other Comprehensive Income (Loss), Deferred Acquistion Costs And Life Policy Reserves And Other, Net of Tax, Period Increase (Decrease)
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No definition available.
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Other Comprehensive Income (Loss), Deferred Acquistion Costs And Life Policy Reserves And Other, Tax, Period Increase (Decrease)
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No definition available.
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| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment for Life Deferred Acquisition Costs, Life Policy Reserves and Other, Before Tax
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No definition available.
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| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment for Life Deferred Acquisition Costs, Life Policy Reserves and Other, Net of Tax
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No definition available.
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Other Comprehensive Income (Loss), Reclassification Adjustment for Life Deferred Acquisition Costs, Life Policy Reserves and Other, Tax
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No definition available.
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| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Amortization of Actuarial Gain (Loss) and Prior Service Cost, before Tax
+ References
No definition available.
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| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Amortization of Actuarial Gain (Loss) and Prior Service Cost, Net of Tax
+ References
No definition available.
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| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Amortization of Actuarial Gain (Loss) and Prior Service Cost, Tax
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.
+ References
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| - Definition
Amount before tax and reclassification adjustments of other comprehensive income (loss).
+ References
No definition available.
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| - Definition
Amount after tax, before reclassification adjustments of other comprehensive income (loss).
+ References
No definition available.
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| - Definition
Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.
+ References
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| - Definition
Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.
+ References
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| - Definition
Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
+ References
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