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Investments - Gross unrealized losses and fair value by the type and length of time held in continuous unrealized loss position (Details) $ in Millions | Mar. 31, 2018 USD ($) contract | Dec. 31, 2017 USD ($) contract
--- | --- | ---
Fixed income and equity securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract |  | 2,953
Fair value, continuous unrealized loss position for less than 12 months |  | $ 19,049
Unrealized losses, continuous unrealized loss position for less than 12 months |  | $ (170)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract |  | 594
Fair value, continuous unrealized loss position for 12 months or more |  | $ 3,971
Unrealized losses, continuous unrealized loss position for 12 months or more |  | (125)
Total unrealized losses |  |
Total unrealized losses | $ (745) | $ (295)
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 57 | 66
Fair value, continuous unrealized loss position for less than 12 months | $ 1,514 | $ 2,829
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (16) | $ (18)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 13 | 18
Fair value, continuous unrealized loss position for 12 months or more | $ 74 | $ 182
Unrealized losses, continuous unrealized loss position for 12 months or more | (1) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (17) | $ (20)
Municipal |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 2,535 | 1,756
Fair value, continuous unrealized loss position for less than 12 months | $ 4,626 | $ 3,143
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (74) | $ (24)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 160 | 165
Fair value, continuous unrealized loss position for 12 months or more | $ 323 | $ 349
Unrealized losses, continuous unrealized loss position for 12 months or more | (18) | (12)
Total unrealized losses |  |
Total unrealized losses | $ (92) | $ (36)
Corporate |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 1,656 | 781
Fair value, continuous unrealized loss position for less than 12 months | $ 22,720 | $ 11,616
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (458) | $ (102)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 199 | 208
Fair value, continuous unrealized loss position for 12 months or more | $ 3,006 | $ 3,289
Unrealized losses, continuous unrealized loss position for 12 months or more | (153) | (102)
Total unrealized losses |  |
Total unrealized losses | $ (611) | $ (204)
Foreign government |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 43 | 45
Fair value, continuous unrealized loss position for less than 12 months | $ 531 | $ 580
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (9) | $ (10)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 4 | 5
Fair value, continuous unrealized loss position for 12 months or more | $ 39 | $ 44
Unrealized losses, continuous unrealized loss position for 12 months or more | (1) | (1)
Total unrealized losses |  |
Total unrealized losses | $ (10) | $ (11)
Asset-backed securities (“ABS”) |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 80 | 57
Fair value, continuous unrealized loss position for less than 12 months | $ 541 | $ 476
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (6) | $ (3)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 7 | 9
Fair value, continuous unrealized loss position for 12 months or more | $ 11 | $ 34
Unrealized losses, continuous unrealized loss position for 12 months or more | (4) | (4)
Total unrealized losses |  |
Total unrealized losses | $ (10) | $ (7)
Residential mortgage-backed securities (“RMBS”) |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 139 | 118
Fair value, continuous unrealized loss position for less than 12 months | $ 36 | $ 35
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (1) | $ (1)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 181 | 181
Fair value, continuous unrealized loss position for 12 months or more | $ 43 | $ 50
Unrealized losses, continuous unrealized loss position for 12 months or more | (2) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (3) | $ (3)
Commercial mortgage-backed securities (“CMBS”) |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 0 | 2
Fair value, continuous unrealized loss position for less than 12 months | $ 0 | $ 1
Unrealized losses, continuous unrealized loss position for less than 12 months | $ 0 | $ 0
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 6 | 6
Fair value, continuous unrealized loss position for 12 months or more | $ 24 | $ 23
Unrealized losses, continuous unrealized loss position for 12 months or more | (2) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (2) | $ (2)
Redeemable preferred stock |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract |  | 1
Fair value, continuous unrealized loss position for less than 12 months |  | $ 0
Unrealized losses, continuous unrealized loss position for less than 12 months |  | $ 0
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract |  | 0
Fair value, continuous unrealized loss position for 12 months or more |  | $ 0
Unrealized losses, continuous unrealized loss position for 12 months or more |  | 0
Total unrealized losses |  |
Total unrealized losses |  | $ 0
Fixed income securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 4,510 | 2,826
Fair value, continuous unrealized loss position for less than 12 months | $ 29,968 | $ 18,680
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (564) | $ (158)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 570 | 592
Fair value, continuous unrealized loss position for 12 months or more | $ 3,520 | $ 3,971
Unrealized losses, continuous unrealized loss position for 12 months or more | (181) | (125)
Total unrealized losses |  |
Total unrealized losses | $ (745) | $ (283)
Equity securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract |  | 127
Fair value, continuous unrealized loss position for less than 12 months |  | $ 369
Unrealized losses, continuous unrealized loss position for less than 12 months |  | $ (12)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract |  | 2
Fair value, continuous unrealized loss position for 12 months or more |  | $ 0
Unrealized losses, continuous unrealized loss position for 12 months or more |  | 0
Total unrealized losses |  |
Total unrealized losses |  | $ (12)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 4,161 | 2,706
Fair value, continuous unrealized loss position for less than 12 months | $ 27,020 | $ 17,668
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (470) | $ (134)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 516 | 535
Fair value, continuous unrealized loss position for 12 months or more | $ 3,284 | $ 3,751
Unrealized losses, continuous unrealized loss position for 12 months or more | (153) | (98)
Total unrealized losses |  |
Total unrealized losses | $ (623) | $ (232)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues, continuous unrealized loss position for less than 12 months | contract | 349 | 120
Fair value, continuous unrealized loss position for less than 12 months | $ 2,948 | $ 1,012
Unrealized losses, continuous unrealized loss position for less than 12 months | $ (94) | $ (24)
12 months or more |  |
Number of issues, continuous unrealized loss position for 12 months or more | contract | 54 | 57
Fair value, continuous unrealized loss position for 12 months or more | $ 236 | $ 220
Unrealized losses, continuous unrealized loss position for 12 months or more | (28) | (27)
Total unrealized losses |  |
Total unrealized losses | $ (122) | $ (51)

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