| **Income Taxes (Significant components of the Company's deferred tax assets and liabilities) (Details) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2012 | Dec. 31, 2011 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Deferred Tax Assets:**                                                                                                                                |          |          |
| Property and casualty claim and claim adjustment expense reserves                                                                                       | $ 352         | $ 419         |
| Unearned premium reserves                                                                                                                               | 162           | 142           |
| Receivables                                                                                                                                             | 60            | 74            |
| Employee benefits                                                                                                                                       | 384           | 323           |
| Life settlement contracts                                                                                                                               | 45            | 61            |
| Investment valuation differences                                                                                                                        |     | 3             |
| Net loss and tax credits carried forward                                                                                                                | 8             | 25            |
| Other assets                                                                                                                                            | 152           | 159           |
| Gross deferred tax assets                                                                                                                               | 1,163         | 1,206         |
| **Deferred Tax Liabilities:**                                                                                                                           |          |          |
| Investment valuation differences                                                                                                                        | 38            |     |
| Deferred acquisition costs                                                                                                                              | 238           | 241           |
| Net unrealized gains                                                                                                                                    | 737           | 513           |
| Other liabilities                                                                                                                                       | 57            | 37            |
| Gross deferred tax liabilities                                                                                                                          | 1,070         | 791           |
| Net deferred tax asset (liability)                                                                                                                      | $ 93          | $ 415         |

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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.
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| - Definition
The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from loss reserves other than estimated credit losses.
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| - Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the unearned premiums reserve.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.
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| - Definition
The amount as of the balance sheet date of the estimated future tax effects attributable to policy acquisition costs being expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, which will reverse in future periods when amortization of such capitalized costs cannot be deducted for tax purposes.
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Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments).
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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.
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Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains in other comprehensive income.
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The cumulative amount of future tax effects arising from the unused tax credit carryforward that cannot be utilized on the tax return during a year that may be carried forward to reduce taxable income or taxes payable in a future year; a tax credit carryforward is the amount by which tax credits available for utilization exceed statutory limitations.
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