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Investments - Continuous unrealized loss positions (Details) $ in Millions | Dec. 31, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Fixed income securities |  |
Number of issues | contract | 31 | 11
Fair value | $ 1,713 | $ 55
Unrealized losses | $ (26) | $ 0
Fixed income securities |  |
Number of issues | contract | 10 | 38
Fair value | $ 26 | $ 364
Unrealized losses | 0 | (6)
Total unrealized losses | $ (26) | $ (6)
Municipal |  |
Fixed income securities |  |
Number of issues | contract | 307 | 943
Fair value | $ 576 | $ 1,633
Unrealized losses | $ (9) | $ (10)
Fixed income securities |  |
Number of issues | contract | 1 | 1,147
Fair value | $ 14 | $ 1,554
Unrealized losses | (2) | (33)
Total unrealized losses | $ (11) | $ (43)
Corporate |  |
Fixed income securities |  |
Number of issues | contract | 186 | 1,736
Fair value | $ 1,392 | $ 19,243
Unrealized losses | $ (20) | $ (543)
Fixed income securities |  |
Number of issues | contract | 65 | 645
Fair value | $ 485 | $ 8,374
Unrealized losses | (27) | (347)
Total unrealized losses | $ (47) | $ (890)
Foreign government |  |
Fixed income securities |  |
Number of issues | contract | 55 | 7
Fair value | $ 412 | $ 20
Unrealized losses | $ (4) | $ (1)
Fixed income securities |  |
Number of issues | contract | 6 | 27
Fair value | $ 102 | $ 412
Unrealized losses | (1) | (4)
Total unrealized losses | $ (5) | $ (5)
ABS |  |
Fixed income securities |  |
Number of issues | contract | 36 | 64
Fair value | $ 193 | $ 454
Unrealized losses | $ (2) | $ (5)
Fixed income securities |  |
Number of issues | contract | 23 | 28
Fair value | $ 160 | $ 161
Unrealized losses | (4) | (5)
Total unrealized losses | $ (6) | $ (10)
MBS |  |
Fixed income securities |  |
Number of issues | contract | 27 | 169
Fair value | $ 15 | $ 37
Unrealized losses | $ 0 | $ 0
Fixed income securities |  |
Number of issues | contract | 123 | 197
Fair value | $ 14 | $ 52
Unrealized losses | (1) | (3)
Total unrealized losses | $ (1) | $ (3)
Fixed income securities |  |
Fixed income securities |  |
Number of issues | contract | 642 | 2,930
Fair value | $ 4,301 | $ 21,442
Unrealized losses | $ (61) | $ (559)
Fixed income securities |  |
Number of issues | contract | 228 | 2,082
Fair value | $ 801 | $ 10,917
Unrealized losses | (35) | (398)
Total unrealized losses | $ (96) | $ (957)
Investment grade fixed income securities |  |
Fixed income securities |  |
Number of issues | contract | 581 | 2,348
Fair value | $ 3,878 | $ 17,485
Unrealized losses | $ (41) | $ (331)
Fixed income securities |  |
Number of issues | contract | 185 | 2,021
Fair value | $ 594 | $ 10,626
Unrealized losses | (20) | (360)
Total unrealized losses | $ (61) | $ (691)
Below investment grade fixed income securities |  |
Fixed income securities |  |
Number of issues | contract | 61 | 582
Fair value | $ 423 | $ 3,957
Unrealized losses | $ (20) | $ (228)
Fixed income securities |  |
Number of issues | contract | 43 | 61
Fair value | $ 207 | $ 291
Unrealized losses | (15) | (38)
Total unrealized losses | $ (35) | $ (266)

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