| **Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions**        | Sep. 30, 2016 | Dec. 31, 2015 |
|-----------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | $ 1,630       | $ 7,464       |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 29            | 342           |
| Estimated Fair Value, 12 Months or Longer                                                                 | 672           | 502           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 36            | 50            |
| Estimated Fair Value, Total                                                                               | 2,302         | 7,966         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 65            | 392           |
| Corporate and other bonds [Member]                                                                        |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 617           | 4,882         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10            | 302           |
| Estimated Fair Value, 12 Months or Longer                                                                 | 338           | 162           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 26            | 40            |
| Estimated Fair Value, Total                                                                               | 955           | 5,044         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 36            | 342           |
| States, municipalities and political subdivisions [Member]                                                |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 163           | 338           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2             | 8             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 9             | 75            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0             | 0             |
| Estimated Fair Value, Total                                                                               | 172           | 413           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 2             | 8             |
| Residential mortgage-backed [Member]                                                                      |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 273           | 963           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6             | 9             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 212           | 164           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 9             | 8             |
| Estimated Fair Value, Total                                                                               | 485           | 1,127         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 15            | 17            |
| Commercial mortgage-backed [Member]                                                                       |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 391           | 652           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7             | 10            |
| Estimated Fair Value, 12 Months or Longer                                                                 | 96            | 96            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1             | 2             |
| Estimated Fair Value, Total                                                                               | 487           | 748           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 8             | 12            |
| Other asset-backed [Member]                                                                               |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 153           | 552           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1             | 8             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 17            | 5             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0             | 0             |
| Estimated Fair Value, Total                                                                               | 170           | 557           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 1             | 8             |
| Total asset-backed [Member]                                                                               |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 817           | 2,167         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14            | 27            |
| Estimated Fair Value, 12 Months or Longer                                                                 | 325           | 265           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10            | 10            |
| Estimated Fair Value, Total                                                                               | 1,142         | 2,432         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 24            | 37            |
| U.S. Treasury and obligations of government-sponsored enterprises [Member]                                |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 2             | 4             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0             | 0             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 0             | 0             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0             | 0             |
| Estimated Fair Value, Total                                                                               | 2             | 4             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 0             | 0             |
| Foreign Government Debt Securities [Member]                                                               |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 16            | 54            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0             | 1             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 0             | 0             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0             | 0             |
| Estimated Fair Value, Total                                                                               | 16            | 54            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 0             | 1             |
| Redeemable preferred stock [Member]                                                                       |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 |          | 3             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |          | 0             |
| Estimated Fair Value, 12 Months or Longer                                                                 |          | 0             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |          | 0             |
| Estimated Fair Value, Total                                                                               |          | 3             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      |          | 0             |
| Total fixed maturity securities available-for-sale [Member]                                               |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 1,615         | 7,448         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 26            | 338           |
| Estimated Fair Value, 12 Months or Longer                                                                 | 672           | 502           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 36            | 50            |
| Estimated Fair Value, Total                                                                               | 2,287         | 7,950         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 62            | 388           |
| Common stock [Member]                                                                                     |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 0             | 3             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1             | 1             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 0             | 0             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0             | 0             |
| Estimated Fair Value, Total                                                                               | 0             | 3             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 1             | 1             |
| Preferred stock [Member]                                                                                  |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 15            | 13            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2             | 3             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 0             | 0             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0             | 0             |
| Estimated Fair Value, Total                                                                               | 15            | 13            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 2             | 3             |
| Total equity securities available-for-sale [Member]                                                       |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 15            | 16            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3             | 4             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 0             | 0             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0             | 0             |
| Estimated Fair Value, Total                                                                               | 15            | 16            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | $ 3           | $ 4           |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.
+ References
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| - Definition
Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.
+ References
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| - Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.
+ References
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| - Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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No definition available.
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