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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, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract
--- | --- | ---
Total unrealized losses |  |
Total unrealized losses | $ (1) |
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 3 | 31
Fair value | $ 20 | $ 1,713
Unrealized losses | $ (1) | $ (26)
12 months or more |  |
Number of issues | contract | 0 | 10
Fair value | $ 0 | $ 26
Unrealized losses | $ 0 | 0
Total unrealized losses |  |
Total unrealized losses |  | $ (26)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 171 | 307
Fair value | $ 343 | $ 576
Unrealized losses | $ (6) | $ (9)
12 months or more |  |
Number of issues | contract | 0 | 1
Fair value | $ 0 | $ 14
Unrealized losses | 0 | (2)
Total unrealized losses |  |
Total unrealized losses | $ (6) | $ (11)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 527 | 186
Fair value | $ 4,326 | $ 1,392
Unrealized losses | $ (232) | $ (20)
12 months or more |  |
Number of issues | contract | 36 | 65
Fair value | $ 213 | $ 485
Unrealized losses | (52) | (27)
Total unrealized losses |  |
Total unrealized losses | $ (284) | $ (47)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 1 | 55
Fair value | $ 1 | $ 412
Unrealized losses | $ 0 | $ (4)
12 months or more |  |
Number of issues | contract | 0 | 6
Fair value | $ 0 | $ 102
Unrealized losses | 0 | (1)
Total unrealized losses |  |
Total unrealized losses | $ 0 | $ (5)
ABS |  |
Less than 12 months |  |
Number of issues | contract | 53 | 36
Fair value | $ 479 | $ 193
Unrealized losses | $ (15) | $ (2)
12 months or more |  |
Number of issues | contract | 16 | 23
Fair value | $ 64 | $ 160
Unrealized losses | (9) | (4)
Total unrealized losses |  |
Total unrealized losses | $ (24) | $ (6)
MBS |  |
Less than 12 months |  |
Number of issues | contract | 28 | 27
Fair value | $ 16 | $ 15
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 85 | 123
Fair value | $ 3 | $ 14
Unrealized losses | 0 | (1)
Total unrealized losses |  |
Total unrealized losses | $ 0 | $ (1)
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 783 | 642
Fair value | $ 5,185 | $ 4,301
Unrealized losses | $ (254) | $ (61)
12 months or more |  |
Number of issues | contract | 137 | 228
Fair value | $ 280 | $ 801
Unrealized losses | (61) | (35)
Total unrealized losses |  |
Total unrealized losses | $ (315) | $ (96)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 402 | 581
Fair value | $ 2,253 | $ 3,878
Unrealized losses | $ (86) | $ (41)
12 months or more |  |
Number of issues | contract | 102 | 185
Fair value | $ 114 | $ 594
Unrealized losses | (25) | (20)
Total unrealized losses |  |
Total unrealized losses | $ (111) | $ (61)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 381 | 61
Fair value | $ 2,932 | $ 423
Unrealized losses | $ (168) | $ (20)
12 months or more |  |
Number of issues | contract | 35 | 43
Fair value | $ 166 | $ 207
Unrealized losses | (36) | (15)
Total unrealized losses |  |
Total unrealized losses | $ (204) | $ (35)

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