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Investments (Securities in a gross unrealized loss position) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Estimated Fair Value, Less Than 12 Months | $ 7,947 | $ 1,819
Gross Unrealized Losses, Less than 12 Months | 334 | 27
Estimated Fair Value, 12 Months or Longer | 552 | 866
Gross Unrealized Losses, 12 Months or Longer | 106 | 128
Estimated Fair Value, Total | 8,499 | 2,685
Gross Unrealized Losses, Total | 440 | 155
Corporate and other bonds [Member] |  |
Estimated Fair Value, Less Than 12 Months | 3,478 | 846
Gross Unrealized Losses, Less than 12 Months | 143 | 13
Estimated Fair Value, 12 Months or Longer | 33 | 108
Gross Unrealized Losses, 12 Months or Longer | 4 | 8
Estimated Fair Value, Total | 3,511 | 954
Gross Unrealized Losses, Total | 147 | 21
States, municipalities and political subdivisions [Member] |  |
Estimated Fair Value, Less Than 12 Months | 2,075 | 254
Gross Unrealized Losses, Less than 12 Months | 130 | 5
Estimated Fair Value, 12 Months or Longer | 119 | 165
Gross Unrealized Losses, 12 Months or Longer | 43 | 39
Estimated Fair Value, Total | 2,194 | 419
Gross Unrealized Losses, Total | 173 | 44
Residential mortgage-backed [Member] |  |
Estimated Fair Value, Less Than 12 Months | 1,462 | 583
Gross Unrealized Losses, Less than 12 Months | 33 | 5
Estimated Fair Value, 12 Months or Longer | 321 | 452
Gross Unrealized Losses, 12 Months or Longer | 55 | 66
Estimated Fair Value, Total | 1,783 | 1,035
Gross Unrealized Losses, Total | 88 | 71
Commercial mortgage-backed [Member] |  |
Estimated Fair Value, Less Than 12 Months | 593 | 85
Gross Unrealized Losses, Less than 12 Months | 23 | 2
Estimated Fair Value, 12 Months or Longer | 79 | 141
Gross Unrealized Losses, 12 Months or Longer | 4 | 15
Estimated Fair Value, Total | 672 | 226
Gross Unrealized Losses, Total | 27 | 17
Other asset-backed [Member] |  |
Estimated Fair Value, Less Than 12 Months | 235 |
Gross Unrealized Losses, Less than 12 Months | 2 |
Estimated Fair Value, 12 Months or Longer |  |
Gross Unrealized Losses, 12 Months or Longer |  |
Estimated Fair Value, Total | 235 |
Gross Unrealized Losses, Total | 2 |
Total asset-backed [Member] |  |
Estimated Fair Value, Less Than 12 Months | 2,290 | 668
Gross Unrealized Losses, Less than 12 Months | 58 | 7
Estimated Fair Value, 12 Months or Longer | 400 | 593
Gross Unrealized Losses, 12 Months or Longer | 59 | 81
Estimated Fair Value, Total | 2,690 | 1,261
Gross Unrealized Losses, Total | 117 | 88
Foreign government [Member] |  |
Estimated Fair Value, Less Than 12 Months | 65 |
Gross Unrealized Losses, Less than 12 Months | 1 |
Estimated Fair Value, 12 Months or Longer |  |
Gross Unrealized Losses, 12 Months or Longer |  |
Estimated Fair Value, Total | 65 |
Gross Unrealized Losses, Total | 1 |
U.S. Treasury and obligations of government-sponsored enterprises [Member] |  |
Estimated Fair Value, Less Than 12 Months |  | 23
Gross Unrealized Losses, Less than 12 Months |  | 1
Estimated Fair Value, 12 Months or Longer |  |
Gross Unrealized Losses, 12 Months or Longer |  |
Estimated Fair Value, Total |  | 23
Gross Unrealized Losses, Total |  | 1
Redeemable preferred stock [Member] |  |
Estimated Fair Value, Less Than 12 Months | 39 | 28
Gross Unrealized Losses, Less than 12 Months | 2 | 1
Estimated Fair Value, 12 Months or Longer |  |
Gross Unrealized Losses, 12 Months or Longer |  |
Estimated Fair Value, Total | 39 | 28
Gross Unrealized Losses, Total | $ 2 | $ 1

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