| **Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions**        | Dec. 31, 2016 | Dec. 31, 2015 |
|-----------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | $ 6,989       | $ 7,464       |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 167           | 342           |
| Estimated Fair Value, 12 Months or Longer                                                                 | 584           | 502           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 29            | 50            |
| Estimated Fair Value, Total                                                                               | 7,573         | 7,966         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 196           | 392           |
| Corporate and other bonds [Member]                                                                        |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 2,615         | 4,882         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 61            | 302           |
| Estimated Fair Value, 12 Months or Longer                                                                 | 254           | 162           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 15            | 40            |
| Estimated Fair Value, Total                                                                               | 2,869         | 5,044         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 76            | 342           |
| States, municipalities and political subdivisions [Member]                                                |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 959           | 338           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 32            | 8             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 23            | 75            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1             | 0             |
| Estimated Fair Value, Total                                                                               | 982           | 413           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 33            | 8             |
| Residential mortgage-backed [Member]                                                                      |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 2,136         | 963           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 44            | 9             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 201           | 164           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7             | 8             |
| Estimated Fair Value, Total                                                                               | 2,337         | 1,127         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 51            | 17            |
| Commercial mortgage-backed [Member]                                                                       |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 756           | 652           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22            | 10            |
| Estimated Fair Value, 12 Months or Longer                                                                 | 69            | 96            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2             | 2             |
| Estimated Fair Value, Total                                                                               | 825           | 748           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 24            | 12            |
| Other asset-backed [Member]                                                                               |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 398           | 552           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5             | 8             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 24            | 5             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0             | 0             |
| Estimated Fair Value, Total                                                                               | 422           | 557           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 5             | 8             |
| Total asset-backed [Member]                                                                               |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 3,290         | 2,167         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 71            | 27            |
| Estimated Fair Value, 12 Months or Longer                                                                 | 294           | 265           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 9             | 10            |
| Estimated Fair Value, Total                                                                               | 3,584         | 2,432         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 80            | 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                                                                 | 5             | 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                                                                               | 5             | 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                                                                 | 108           | 54            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3             | 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                                                                               | 108           | 54            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 3             | 1             |
| Redeemable preferred 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 | 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                                                                               | 0             | 3             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 0             | 0             |
| Total fixed maturity securities available-for-sale [Member]                                               |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 6,977         | 7,448         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 167           | 338           |
| Estimated Fair Value, 12 Months or Longer                                                                 | 571           | 502           |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 25            | 50            |
| Estimated Fair Value, Total                                                                               | 7,548         | 7,950         |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | 192           | 388           |
| Common 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 |          | 1             |
| 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                      |          | 1             |
| Preferred stock [Member]                                                                                  |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 | 12            | 13            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0             | 3             |
| Estimated Fair Value, 12 Months or Longer                                                                 | 13            | 0             |
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4             | 0             |
| Estimated Fair Value, Total                                                                               | 25            | 13            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      | $ 4           | 3             |
| Total equity securities available-for-sale [Member]                                                       |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                |          |          |
| Estimated Fair Value, Less than 12 Months                                                                 |          | 16            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |          | 4             |
| 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                                                                               |          | 16            |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss                      |          | $ 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.
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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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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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