| **Fair Value Measurements (Fair Value Hierarchy For Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2013 | Dec. 31, 2012 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | $ 9,121       | $ 9,093       |
| Available for sale securities, equity securities                                                                                                                   | 4,375         | 3,373         |
| Separate accounts                                                                                                                                                  | 692           | 734           |
| Fair value of asset                                                                                                                                                | 14,192        | 13,164        |
| Top Hat Savings Plan [Member]                                                                                                                                      |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Other investments                                                                                                                                                  | 14            | 9             |
| Fixed Maturities [Member]                                                                                                                                          |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 9,121         | 9,093         |
| Fixed Maturities [Member] | States, Municipalities And Political Subdivisions [Member]                                                                             |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 3,211         | 3,289         |
| Fixed Maturities [Member] | Convertibles And Bonds With Warrants Attached [Member]                                                                                 |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 17            | 31            |
| Fixed Maturities [Member] | United States Government [Member]                                                                                                      |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 7             | 8             |
| Fixed Maturities [Member] | Government-Sponsored Enterprises [Member]                                                                                              |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 200           | 164           |
| Fixed Maturities [Member] | Foreign Government [Member]                                                                                                            |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 10            | 3             |
| Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]                                                                                         |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 143           | 28            |
| Fixed Maturities [Member] | Corporate Securities [Member]                                                                                                          |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 5,533         | 5,570         |
| Equity Securities [Member] | Common Stock [Member]                                                                                                                 |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, equity securities                                                                                                                   | 4,213         | 3,238         |
| Equity Securities [Member] | Preferred Stock [Member]                                                                                                              |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, equity securities                                                                                                                   | 162           | 135           |
| Taxable Fixed Maturities [Member]                                                                                                                                  |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Separate accounts                                                                                                                                                  | 682           | 689           |
| Fair Value, Inputs, Level 1 [Member]                                                                                                                               |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Fair value of asset                                                                                                                                                | 4,234         | 3,255         |
| Fair Value, Inputs, Level 1 [Member] | Top Hat Savings Plan [Member]                                                                                               |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Other investments                                                                                                                                                  | 14            | 9             |
| Fair Value, Inputs, Level 1 [Member] | Fixed Maturities [Member]                                                                                                   |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 7             | 8             |
| Fair Value, Inputs, Level 1 [Member] | Fixed Maturities [Member] | United States Government [Member]                                                               |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 7             | 8             |
| Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Common Stock [Member]                                                                          |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, equity securities                                                                                                                   | 4,213         | 3,238         |
| Fair Value, Inputs, Level 2 [Member]                                                                                                                               |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Fair value of asset                                                                                                                                                | 9,954         | 9,904         |
| Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member]                                                                                                   |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 9,112         | 9,081         |
| Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | States, Municipalities And Political Subdivisions [Member]                                      |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 3,211         | 3,288         |
| Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Convertibles And Bonds With Warrants Attached [Member]                                          |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 17            | 31            |
| Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Government-Sponsored Enterprises [Member]                                                       |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 200           | 164           |
| Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Foreign Government [Member]                                                                     |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 10            | 3             |
| Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]                                                  |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 143           | 28            |
| Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Corporate Securities [Member]                                                                   |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 5,531         | 5,567         |
| Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Preferred Stock [Member]                                                                       |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, equity securities                                                                                                                   | 160           | 134           |
| Fair Value, Inputs, Level 2 [Member] | Taxable Fixed Maturities [Member]                                                                                           |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Separate accounts                                                                                                                                                  | 682           | 689           |
| Fair Value, Inputs, Level 3 [Member]                                                                                                                               |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Fair value of asset                                                                                                                                                | 4             | 5             |
| Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                                                                                                   |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 2             | 4             |
| Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | States, Municipalities And Political Subdivisions [Member]                                      |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 0             | 1             |
| Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | Corporate Securities [Member]                                                                   |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, debt Securities                                                                                                                     | 2             | 3             |
| Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Preferred Stock [Member]                                                                       |          |          |
| **Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]**                                                                    |          |          |
| Available for sale securities, equity securities                                                                                                                   | $ 2           | $ 1           |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of debt securities categorized neither as held-to-maturity nor trading.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of equity securities categorized neither as held-to-maturity nor as trading.
+ References
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| X                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of the other investment not readily marketable determined by management based upon fair value methods, including pricing of similar securities and valuation techniques, that was used to record the investment for financial reporting purposes.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The fair value of the assets held by the Entity for the benefit of separate account policyholders.
+ References
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