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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 | Sep. 30, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 8 | 11
Fair value | $ 165 | $ 55
Unrealized losses | $ (1) | $ 0
12 months or more |  |
Number of issues | contract | 17 | 38
Fair value | $ 48 | $ 364
Unrealized losses | 0 | (6)
Total unrealized losses |  |
Total unrealized losses | $ (1) | $ (6)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 204 | 943
Fair value | $ 373 | $ 1,633
Unrealized losses | $ (2) | $ (10)
12 months or more |  |
Number of issues | contract | 1 | 1,147
Fair value | $ 14 | $ 1,554
Unrealized losses | (2) | (33)
Total unrealized losses |  |
Total unrealized losses | $ (4) | $ (43)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 206 | 1,735
Fair value | $ 1,671 | $ 19,243
Unrealized losses | $ (31) | $ (543)
12 months or more |  |
Number of issues | contract | 96 | 645
Fair value | $ 973 | $ 8,374
Unrealized losses | (39) | (347)
Total unrealized losses |  |
Total unrealized losses | $ (70) | $ (890)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 32 | 7
Fair value | $ 205 | $ 20
Unrealized losses | $ (2) | $ (1)
12 months or more |  |
Number of issues | contract | 6 | 27
Fair value | $ 103 | $ 412
Unrealized losses | (1) | (4)
Total unrealized losses |  |
Total unrealized losses | $ (3) | $ (5)
Asset-backed securities (“ABS”) |  |
Less than 12 months |  |
Number of issues | contract | 33 | 64
Fair value | $ 150 | $ 454
Unrealized losses | $ (2) | $ (5)
12 months or more |  |
Number of issues | contract | 20 | 28
Fair value | $ 122 | $ 161
Unrealized losses | (4) | (5)
Total unrealized losses |  |
Total unrealized losses | $ (6) | $ (10)
Residential mortgage-backed securities (“RMBS”) |  |
Less than 12 months |  |
Number of issues | contract | 26 | 166
Fair value | $ 15 | $ 30
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 145 | 195
Fair value | $ 20 | $ 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 | 1 | 3
Fair value | $ 5 | $ 7
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 1 | 2
Fair value | $ 2 | $ 0
Unrealized losses | (1) | (1)
Total unrealized losses |  |
Total unrealized losses | $ (1) | $ (1)
Redeemable preferred stock |  |
Less than 12 months |  |
Number of issues | contract | 0 | 1
Fair value | $ 0 | $ 0
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 0 | 0
Fair value | $ 0 | $ 0
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ 0 | $ 0
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 510 | 2,930
Fair value | $ 2,584 | $ 21,442
Unrealized losses | $ (38) | $ (559)
12 months or more |  |
Number of issues | contract | 286 | 2,082
Fair value | $ 1,282 | $ 10,917
Unrealized losses | (48) | (398)
Total unrealized losses |  |
Total unrealized losses | $ (86) | $ (957)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 426 | 2,348
Fair value | $ 2,088 | $ 17,485
Unrealized losses | $ (13) | $ (331)
12 months or more |  |
Number of issues | contract | 237 | 2,021
Fair value | $ 991 | $ 10,626
Unrealized losses | (23) | (360)
Total unrealized losses |  |
Total unrealized losses | $ (36) | $ (691)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 84 | 582
Fair value | $ 496 | $ 3,957
Unrealized losses | $ (25) | $ (228)
12 months or more |  |
Number of issues | contract | 49 | 61
Fair value | $ 291 | $ 291
Unrealized losses | (25) | (38)
Total unrealized losses |  |
Total unrealized losses | $ (50) | $ (266)

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