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Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 3,620 | $ 6,989
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 40 | 167
Estimated Fair Value, 12 Months or Longer | 1,455 | 584
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 49 | 29
Estimated Fair Value, Total | 5,075 | 7,573
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 89 | 196
Corporate and other bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1,354 | 2,615
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 21 | 61
Estimated Fair Value, 12 Months or Longer | 168 | 254
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7 | 15
Estimated Fair Value, Total | 1,522 | 2,869
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 28 | 76
States, municipalities and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 72 | 959
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 32
Estimated Fair Value, 12 Months or Longer | 85 | 23
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 1
Estimated Fair Value, Total | 157 | 982
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 2 | 33
Residential mortgage-backed |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1,228 | 2,136
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5 | 44
Estimated Fair Value, 12 Months or Longer | 947 | 201
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 27 | 7
Estimated Fair Value, Total | 2,175 | 2,337
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 32 | 51
Commercial mortgage-backed |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 403 | 756
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 22
Estimated Fair Value, 12 Months or Longer | 212 | 69
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10 | 2
Estimated Fair Value, Total | 615 | 825
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 14 | 24
Other asset-backed |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 248 | 398
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 5
Estimated Fair Value, 12 Months or Longer | 18 | 24
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 0
Estimated Fair Value, Total | 266 | 422
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 5 | 5
Total asset-backed |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1,879 | 3,290
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 12 | 71
Estimated Fair Value, 12 Months or Longer | 1,177 | 294
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 39 | 9
Estimated Fair Value, Total | 3,056 | 3,584
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 51 | 80
U.S. Treasury and obligations of government-sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 49 | 5
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 0
Estimated Fair Value, 12 Months or Longer | 21 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 0
Estimated Fair Value, Total | 70 | 5
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 4 | 0
Foreign government |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 166 | 108
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 3
Estimated Fair Value, 12 Months or Longer | 4 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Estimated Fair Value, Total | 170 | 108
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 2 | 3
Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 3,520 | 6,977
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 38 | 167
Estimated Fair Value, 12 Months or Longer | 1,455 | 571
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 49 | 25
Estimated Fair Value, Total | 4,975 | 7,548
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 87 | 192
Common Stock |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 7 |
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 | 7 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 |
Preferred stock |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 93 |
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 | 93 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 |
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 100 | 12
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 0
Estimated Fair Value, 12 Months or Longer | 0 | 13
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 4
Estimated Fair Value, Total | 100 | 25
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 2 | $ 4

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