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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 | Jun. 30, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract
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U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 0 | 11
Fair value | $ 0 | $ 55
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 21 | 38
Fair value | $ 63 | $ 364
Unrealized losses | 0 | (6)
Total unrealized losses |  |
Total unrealized losses | $ 0 | $ (6)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 85 | 943
Fair value | $ 133 | $ 1,633
Unrealized losses | $ 0 | $ (10)
12 months or more |  |
Number of issues | contract | 103 | 1,147
Fair value | $ 98 | $ 1,554
Unrealized losses | (3) | (33)
Total unrealized losses |  |
Total unrealized losses | $ (3) | $ (43)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 129 | 1,735
Fair value | $ 1,120 | $ 19,243
Unrealized losses | $ (19) | $ (543)
12 months or more |  |
Number of issues | contract | 271 | 645
Fair value | $ 3,054 | $ 8,374
Unrealized losses | (59) | (347)
Total unrealized losses |  |
Total unrealized losses | $ (78) | $ (890)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 2 | 7
Fair value | $ 46 | $ 20
Unrealized losses | $ 0 | $ (1)
12 months or more |  |
Number of issues | contract | 6 | 27
Fair value | $ 141 | $ 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 | 18 | 64
Fair value | $ 121 | $ 454
Unrealized losses | $ (2) | $ (5)
12 months or more |  |
Number of issues | contract | 18 | 28
Fair value | $ 97 | $ 161
Unrealized losses | (3) | (5)
Total unrealized losses |  |
Total unrealized losses | $ (5) | $ (10)
Residential mortgage-backed securities (“RMBS”) |  |
Less than 12 months |  |
Number of issues | contract | 52 | 166
Fair value | $ 8 | $ 30
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 165 | 195
Fair value | $ 39 | $ 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 | 2 | 3
Fair value | $ 8 | $ 7
Unrealized losses | $ (3) | $ 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 | $ (3) | $ (1)
Redeemable preferred stock |  |
Less than 12 months |  |
Number of issues | contract | 1 | 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 | 289 | 2,930
Fair value | $ 1,436 | $ 21,442
Unrealized losses | $ (24) | $ (559)
12 months or more |  |
Number of issues | contract | 585 | 2,082
Fair value | $ 3,492 | $ 10,917
Unrealized losses | (67) | (398)
Total unrealized losses |  |
Total unrealized losses | $ (91) | $ (957)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 201 | 2,348
Fair value | $ 801 | $ 17,485
Unrealized losses | $ (3) | $ (331)
12 months or more |  |
Number of issues | contract | 514 | 2,021
Fair value | $ 3,068 | $ 10,626
Unrealized losses | (44) | (360)
Total unrealized losses |  |
Total unrealized losses | $ (47) | $ (691)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 88 | 582
Fair value | $ 635 | $ 3,957
Unrealized losses | $ (21) | $ (228)
12 months or more |  |
Number of issues | contract | 71 | 61
Fair value | $ 424 | $ 291
Unrealized losses | (23) | (38)
Total unrealized losses |  |
Total unrealized losses | $ (44) | $ (266)

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