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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, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 9 | 11
Fair value | $ 112 | $ 55
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 39 | 38
Fair value | $ 259 | $ 364
Unrealized losses | (2) | (6)
Total unrealized losses |  |
Total unrealized losses | $ (2) | $ (6)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 102 | 943
Fair value | $ 208 | $ 1,633
Unrealized losses | $ 0 | $ (10)
12 months or more |  |
Number of issues | contract | 600 | 1,147
Fair value | $ 742 | $ 1,554
Unrealized losses | (8) | (33)
Total unrealized losses |  |
Total unrealized losses | $ (8) | $ (43)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 304 | 1,735
Fair value | $ 3,249 | $ 19,243
Unrealized losses | $ (42) | $ (543)
12 months or more |  |
Number of issues | contract | 807 | 645
Fair value | $ 10,382 | $ 8,374
Unrealized losses | (200) | (347)
Total unrealized losses |  |
Total unrealized losses | $ (242) | $ (890)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 0 | 7
Fair value | $ 0 | $ 20
Unrealized losses | $ 0 | $ (1)
12 months or more |  |
Number of issues | contract | 11 | 27
Fair value | $ 218 | $ 412
Unrealized losses | (1) | (4)
Total unrealized losses |  |
Total unrealized losses | $ (1) | $ (5)
Asset-backed securities (“ABS”) |  |
Less than 12 months |  |
Number of issues | contract | 36 | 64
Fair value | $ 283 | $ 454
Unrealized losses | $ (4) | $ (5)
12 months or more |  |
Number of issues | contract | 34 | 28
Fair value | $ 146 | $ 161
Unrealized losses | (5) | (5)
Total unrealized losses |  |
Total unrealized losses | $ (9) | $ (10)
Residential mortgage-backed securities (“RMBS”) |  |
Less than 12 months |  |
Number of issues | contract | 81 | 166
Fair value | $ 12 | $ 30
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 194 | 195
Fair value | $ 49 | $ 52
Unrealized losses | (1) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (1) | $ (2)
Commercial mortgage-backed securities (“CMBS”) |  |
Less than 12 months |  |
Number of issues | contract | 4 | 3
Fair value | $ 11 | $ 7
Unrealized losses | $ (1) | $ 0
12 months or more |  |
Number of issues | contract | 1 | 2
Fair value | $ 0 | $ 0
Unrealized losses | 0 | (1)
Total unrealized losses |  |
Total unrealized losses | $ (1) | $ (1)
Redeemable preferred stock |  |
Less than 12 months |  |
Number of issues | contract |  | 1
Fair value |  | $ 0
Unrealized losses |  | $ 0
12 months or more |  |
Number of issues | contract |  | 0
Fair value |  | $ 0
Unrealized losses |  | 0
Total unrealized losses |  |
Total unrealized losses |  | $ 0
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 536 | 2,930
Fair value | $ 3,875 | $ 21,442
Unrealized losses | $ (47) | $ (559)
12 months or more |  |
Number of issues | contract | 1,686 | 2,082
Fair value | $ 11,796 | $ 10,917
Unrealized losses | (217) | (398)
Total unrealized losses |  |
Total unrealized losses | $ (264) | $ (957)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 404 | 2,348
Fair value | $ 3,077 | $ 17,485
Unrealized losses | $ (22) | $ (331)
12 months or more |  |
Number of issues | contract | 1,550 | 2,021
Fair value | $ 10,853 | $ 10,626
Unrealized losses | (170) | (360)
Total unrealized losses |  |
Total unrealized losses | $ (192) | $ (691)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 132 | 582
Fair value | $ 798 | $ 3,957
Unrealized losses | $ (25) | $ (228)
12 months or more |  |
Number of issues | contract | 136 | 61
Fair value | $ 943 | $ 291
Unrealized losses | (47) | (38)
Total unrealized losses |  |
Total unrealized losses | $ (72) | $ (266)

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