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Investments - Continuous unrealized loss positions (Details) $ in Millions | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | security | 66 | 46
Fair value | $ 2,829 | $ 943
Unrealized losses | $ (18) | $ (9)
12 months or more |  |
Number of issues | security | 18 | 0
Fair value | $ 182 | $ 0
Unrealized losses | (2) | 0
Total unrealized losses | $ (20) | $ (9)
Municipal |  |
Less than 12 months |  |
Number of issues | security | 1,756 | 1,310
Fair value | $ 3,143 | $ 3,073
Unrealized losses | $ (24) | $ (76)
12 months or more |  |
Number of issues | security | 165 | 8
Fair value | $ 349 | $ 29
Unrealized losses | (12) | (11)
Total unrealized losses | $ (36) | $ (87)
Corporate |  |
Less than 12 months |  |
Number of issues | security | 781 | 862
Fair value | $ 11,616 | $ 13,343
Unrealized losses | $ (102) | $ (256)
12 months or more |  |
Number of issues | security | 208 | 83
Fair value | $ 3,289 | $ 678
Unrealized losses | (102) | (63)
Total unrealized losses | $ (204) | $ (319)
Foreign government |  |
Less than 12 months |  |
Number of issues | security | 45 | 41
Fair value | $ 580 | $ 225
Unrealized losses | $ (10) | $ (4)
12 months or more |  |
Number of issues | security | 5 | 0
Fair value | $ 44 | $ 0
Unrealized losses | (1) | 0
Total unrealized losses | $ (11) | $ (4)
ABS |  |
Less than 12 months |  |
Number of issues | security | 57 | 31
Fair value | $ 476 | $ 222
Unrealized losses | $ (3) | $ (1)
12 months or more |  |
Number of issues | security | 9 | 14
Fair value | $ 34 | $ 109
Unrealized losses | (4) | (10)
Total unrealized losses | $ (7) | $ (11)
RMBS |  |
Less than 12 months |  |
Number of issues | security | 118 | 89
Fair value | $ 35 | $ 53
Unrealized losses | $ (1) | $ (1)
12 months or more |  |
Number of issues | security | 181 | 179
Fair value | $ 50 | $ 91
Unrealized losses | (2) | (7)
Total unrealized losses | $ (3) | $ (8)
CMBS |  |
Less than 12 months |  |
Number of issues | security | 2 | 15
Fair value | $ 1 | $ 59
Unrealized losses | $ 0 | $ (4)
12 months or more |  |
Number of issues | security | 6 | 4
Fair value | $ 23 | $ 15
Unrealized losses | (2) | (5)
Total unrealized losses | $ (2) | $ (9)
Redeemable preferred stock |  |
Less than 12 months |  |
Number of issues | security | 1 | 1
Fair value | $ 0 | $ 0
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | security | 0 | 0
Fair value | $ 0 | $ 0
Unrealized losses | 0 | 0
Total unrealized losses | $ 0 | $ 0
Fixed income securities |  |
Less than 12 months |  |
Number of issues | security | 2,826 | 2,395
Fair value | $ 18,680 | $ 17,918
Unrealized losses | $ (158) | $ (351)
12 months or more |  |
Number of issues | security | 592 | 288
Fair value | $ 3,971 | $ 922
Unrealized losses | (125) | (96)
Total unrealized losses | $ (283) | $ (447)
Equity securities |  |
Less than 12 months |  |
Number of issues | security | 127 | 195
Fair value | $ 369 | $ 654
Unrealized losses | $ (12) | $ (56)
12 months or more |  |
Number of issues | security | 2 | 46
Fair value | $ 0 | $ 165
Unrealized losses | 0 | (29)
Total unrealized losses | $ (12) | $ (85)
Fixed income and equity securities |  |
Less than 12 months |  |
Number of issues | security | 2,953 | 2,590
Fair value | $ 19,049 | $ 18,572
Unrealized losses | $ (170) | $ (407)
12 months or more |  |
Number of issues | security | 594 | 334
Fair value | $ 3,971 | $ 1,087
Unrealized losses | (125) | (125)
Total unrealized losses | $ (295) | $ (532)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | security | 2,706 | 2,202
Fair value | $ 17,668 | $ 15,678
Unrealized losses | $ (134) | $ (293)
12 months or more |  |
Number of issues | security | 535 | 201
Fair value | $ 3,751 | $ 493
Unrealized losses | (98) | (51)
Total unrealized losses | $ (232) | $ (344)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | security | 120 | 193
Fair value | $ 1,012 | $ 2,240
Unrealized losses | $ (24) | $ (58)
12 months or more |  |
Number of issues | security | 57 | 87
Fair value | $ 220 | $ 429
Unrealized losses | (27) | (45)
Total unrealized losses | $ (51) | $ (103)

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