| **Reinsurance (Components of Written Premiums) (Details) (USD $)In Millions, unless otherwise specified**          | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------|-----------------|
||
| Direct premiums written, property and casualty                                                                     | $ 8,467         | $ 7,976 | $ 7,673 |
| Assumed premiums written, property and casualty                                                                    | 169             | 102 | 77 |
| Ceded premiums written, property and casualty                                                                      | 2,225           | 1,857 | 1,853 |
| Premiums written, net, property and casualty                                                                       | 6,411           | 6,221 | 5,897 |
| Direct premiums written, accident and health                                                                       | 507             | 529 | 527 |
| Assumed premiums written, accident and health                                                                      | 47              | 50 | 48 |
| Ceded premiums written, accident and health                                                                        | 1               | 2 | 2 |
| Premiums written, net, accident and health                                                                         | 553             | 577 | 573 |
| Direct premiums written, life                                                                                      | 51              | 55 | 60 |
| Assumed premiums written, life                                                                                     |       |    |    |
| Ceded premiums written, life                                                                                       | 51              | 55 | 59 |
| Premiums written, net, life                                                                                        |       |    | 1 |
| Direct premiums written                                                                                            | 9,025           | 8,560 | 8,260 |
| Assumed premiums written                                                                                           | 216             | 152 | 125 |
| Ceded premiums written                                                                                             | 2,277           | 1,914 | 1,914 |
| Premiums written, net                                                                                              | $ 6,964         | $ 6,798 | $ 6,471 |
| Percentage of assumed premiums written to net premiums written [Member]                                            |            |   |   |
| Percentage of assumed premium written to premium written net                                                       | 3.10%           | 2.20% | 1.90% |
| Percentage of assumed premiums written to net premiums written [Member] | Property and Casualty Insurance [Member] |            |   |   |
| Percentage of assumed premium written to premium written net                                                       | 2.60%           | 1.60% | 1.30% |
| Percentage of assumed premiums written to net premiums written [Member] | Accident and Health Insurance [Member]   |            |   |   |
| Percentage of assumed premium written to premium written net                                                       | 8.50%           | 8.70% | 8.40% |
| Percentage of assumed premiums written to net premiums written [Member] | Life Insurance [Member]                  |            |   |   |
| Percentage of assumed premium written to premium written net                                                       |       |    |    |

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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums for all insurance assumed from other insurers, that is premiums ceded to the entity by other insurers.
+ References
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Premiums assumed for all accident and health insurance contracts assumed from other insurers as a result of reinsurance arrangements.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums assumed for all life insurance assumed from other insurers as a result of reinsurance arrangements.
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Premiums assumed for all property and casualty insurance assumed from other insurers as a result of reinsurance arrangements.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total consideration paid and payable to reinsurers during the period pursuant to terms of reinsurance arrangements.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums assumed for all accident and health insurance contracts by another insurer as a result of reinsurance arrangements.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums assumed for life insurance policies by another insurer as a result of reinsurance arrangements.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums for property and casualty coverage ceded to another insurer under reinsurance arrangements.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total consideration paid and payable by direct policyholders for insurance contracts sold by the Entity during the period. This amount does not include premium assumed from or ceded to other insurers.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums written directly by insurer for all accident and health insurance contracts before adding contracts assumed from other insurers or subtracting any amounts assumed by other insurers.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums written directly by insurer for all life insurance before adding contracts assumed from other insurers or subtracting any amounts assumed by other insurers.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums written directly by insurer for all property and casualty insurance before adding contracts assumed from other insurers or subtracting any amounts assumed by other insurers.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums written for all insurance and reinsurance contracts, after adding premiums assumed from other insurers and subtracting any amounts ceded to another insurer.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums written for all accident and health insurance and reinsurance contracts after subtracting any amounts ceded to another insurer.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums written for all life insurance and reinsurance contracts after subtracting any amounts ceded to another insurer.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Premiums written for all property and casualty insurance and reinsurance contracts after subtracting any amounts ceded to another insurer.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of amount of premiums assumed from other companies to net amount of premiums.
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