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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, 2022 USD ($) contract | Dec. 31, 2021 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 149 | 112
Fair value | $ 7,558 | $ 5,451
Unrealized losses | $ (127) | $ (24)
12 months or more |  |
Number of issues | contract | 17 | 4
Fair value | $ 279 | $ 72
Unrealized losses | (14) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (141) | $ (26)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 3,204 | 767
Fair value | $ 4,089 | $ 1,213
Unrealized losses | $ (275) | $ (15)
12 months or more |  |
Number of issues | contract | 50 | 2
Fair value | $ 69 | $ 14
Unrealized losses | (9) | (1)
Total unrealized losses |  |
Total unrealized losses | $ (284) | $ (16)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 2,758 | 1,197
Fair value | $ 21,604 | $ 9,725
Unrealized losses | $ (2,065) | $ (176)
12 months or more |  |
Number of issues | contract | 270 | 22
Fair value | $ 1,183 | $ 130
Unrealized losses | (192) | (16)
Total unrealized losses |  |
Total unrealized losses | $ (2,257) | $ (192)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 93 | 51
Fair value | $ 880 | $ 415
Unrealized losses | $ (37) | $ (6)
12 months or more |  |
Number of issues | contract | 32 | 4
Fair value | $ 86 | $ 3
Unrealized losses | (12) | 0
Total unrealized losses |  |
Total unrealized losses | $ (49) | $ (6)
ABS |  |
Less than 12 months |  |
Number of issues | contract | 196 | 80
Fair value | $ 1,471 | $ 500
Unrealized losses | $ (55) | $ (2)
12 months or more |  |
Number of issues | contract | 58 | 53
Fair value | $ 19 | $ 8
Unrealized losses | (2) | 0
Total unrealized losses |  |
Total unrealized losses | $ (57) | $ (2)
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 6,400 | 2,207
Fair value | $ 35,602 | $ 17,304
Unrealized losses | $ (2,559) | $ (223)
12 months or more |  |
Number of issues | contract | 427 | 85
Fair value | $ 1,636 | $ 227
Unrealized losses | (229) | (19)
Total unrealized losses |  |
Total unrealized losses | $ (2,788) | $ (242)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 5,675 | 1,993
Fair value | $ 31,222 | $ 15,391
Unrealized losses | $ (1,814) | $ (188)
12 months or more |  |
Number of issues | contract | 402 | 71
Fair value | $ 1,556 | $ 183
Unrealized losses | (204) | (8)
Total unrealized losses |  |
Total unrealized losses | $ (2,018) | $ (196)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 725 | 214
Fair value | $ 4,380 | $ 1,913
Unrealized losses | $ (745) | $ (35)
12 months or more |  |
Number of issues | contract | 25 | 14
Fair value | $ 80 | $ 44
Unrealized losses | (25) | (11)
Total unrealized losses |  |
Total unrealized losses | $ (770) | $ (46)

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