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Investments - Continuous unrealized loss positions (Details) $ in Millions | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
U.S. government and agencies |  |
Fixed income securities |  |
Number of issues | security | 11 | 66
Fair value | $ 55 | $ 2,829
Unrealized losses | $ 0 | $ (18)
Fixed income securities |  |
Number of issues | security | 38 | 18
Fair value | $ 364 | $ 182
Unrealized losses | (6) | (2)
Equity securities |  |
Total unrealized losses | $ (6) | $ (20)
Municipal |  |
Fixed income securities |  |
Number of issues | security | 943 | 1,756
Fair value | $ 1,633 | $ 3,143
Unrealized losses | $ (10) | $ (24)
Fixed income securities |  |
Number of issues | security | 1,147 | 165
Fair value | $ 1,554 | $ 349
Unrealized losses | (33) | (12)
Equity securities |  |
Total unrealized losses | $ (43) | $ (36)
Corporate |  |
Fixed income securities |  |
Number of issues | security | 1,735 | 781
Fair value | $ 19,243 | $ 11,616
Unrealized losses | $ (543) | $ (102)
Fixed income securities |  |
Number of issues | security | 645 | 208
Fair value | $ 8,374 | $ 3,289
Unrealized losses | (347) | (102)
Equity securities |  |
Total unrealized losses | $ (890) | $ (204)
Foreign government |  |
Fixed income securities |  |
Number of issues | security | 7 | 45
Fair value | $ 20 | $ 580
Unrealized losses | $ (1) | $ (10)
Fixed income securities |  |
Number of issues | security | 27 | 5
Fair value | $ 412 | $ 44
Unrealized losses | (4) | (1)
Equity securities |  |
Total unrealized losses | $ (5) | $ (11)
ABS |  |
Fixed income securities |  |
Number of issues | security | 64 | 57
Fair value | $ 454 | $ 476
Unrealized losses | $ (5) | $ (3)
Fixed income securities |  |
Number of issues | security | 28 | 9
Fair value | $ 161 | $ 34
Unrealized losses | (5) | (4)
Equity securities |  |
Total unrealized losses | $ (10) | $ (7)
RMBS |  |
Fixed income securities |  |
Number of issues | security | 166 | 118
Fair value | $ 30 | $ 35
Unrealized losses | $ 0 | $ (1)
Fixed income securities |  |
Number of issues | security | 195 | 181
Fair value | $ 52 | $ 50
Unrealized losses | (2) | (2)
Equity securities |  |
Total unrealized losses | $ (2) | $ (3)
CMBS |  |
Fixed income securities |  |
Number of issues | security | 3 | 2
Fair value | $ 7 | $ 1
Unrealized losses | $ 0 | $ 0
Fixed income securities |  |
Number of issues | security | 2 | 6
Fair value | $ 0 | $ 23
Unrealized losses | (1) | (2)
Equity securities |  |
Total unrealized losses | $ (1) | $ (2)
Redeemable preferred stock |  |
Fixed income securities |  |
Number of issues | security | 1 | 1
Fair value | $ 0 | $ 0
Unrealized losses | $ 0 | $ 0
Fixed income securities |  |
Number of issues | security | 0 | 0
Fair value | $ 0 | $ 0
Unrealized losses | 0 | 0
Equity securities |  |
Total unrealized losses | $ 0 | $ 0
Fixed income securities |  |
Fixed income securities |  |
Number of issues | security | 2,930 | 2,826
Fair value | $ 21,442 | $ 18,680
Unrealized losses | $ (559) | $ (158)
Fixed income securities |  |
Number of issues | security | 2,082 | 592
Fair value | $ 10,917 | $ 3,971
Unrealized losses | (398) | (125)
Equity securities |  |
Total unrealized losses | (957) | $ (283)
Equity securities |  |
Equity securities |  |
Number of issues | security |  | 127
Fair value |  | $ 369
Unrealized losses |  | $ (12)
Equity securities |  |
Number of issues | security |  | 2
Fair value |  | $ 0
Unrealized losses |  | 0
Total unrealized losses |  | $ (12)
Fixed income and equity securities |  |
Equity securities |  |
Number of issues | security |  | 2,953
Fair value |  | $ 19,049
Unrealized losses |  | $ (170)
Equity securities |  |
Number of issues | security |  | 594
Fair value |  | $ 3,971
Unrealized losses |  | (125)
Total unrealized losses | $ (957) | $ (295)
Investment grade fixed income securities |  |
Fixed income securities |  |
Number of issues | security | 2,348 | 2,706
Fair value | $ 17,485 | $ 17,668
Unrealized losses | $ (331) | $ (134)
Fixed income securities |  |
Number of issues | security | 2,021 | 535
Fair value | $ 10,626 | $ 3,751
Unrealized losses | (360) | (98)
Equity securities |  |
Total unrealized losses | $ (691) | $ (232)
Below investment grade fixed income securities |  |
Fixed income securities |  |
Number of issues | security | 582 | 120
Fair value | $ 3,957 | $ 1,012
Unrealized losses | $ (228) | $ (24)
Fixed income securities |  |
Number of issues | security | 61 | 57
Fair value | $ 291 | $ 220
Unrealized losses | (38) | (27)
Equity securities |  |
Total unrealized losses | $ (266) | $ (51)

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