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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 | Sep. 30, 2022 USD ($) contract | Dec. 31, 2021 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 137 | 112
Fair value | $ 6,980 | $ 5,451
Unrealized losses | $ (231) | $ (24)
12 months or more |  |
Number of issues | contract | 53 | 4
Fair value | $ 1,428 | $ 72
Unrealized losses | (82) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (313) | $ (26)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 3,880 | 767
Fair value | $ 5,508 | $ 1,213
Unrealized losses | $ (400) | $ (15)
12 months or more |  |
Number of issues | contract | 289 | 2
Fair value | $ 341 | $ 14
Unrealized losses | (61) | (1)
Total unrealized losses |  |
Total unrealized losses | $ (461) | $ (16)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 2,611 | 1,197
Fair value | $ 21,603 | $ 9,725
Unrealized losses | $ (2,305) | $ (176)
12 months or more |  |
Number of issues | contract | 515 | 22
Fair value | $ 2,879 | $ 130
Unrealized losses | (580) | (16)
Total unrealized losses |  |
Total unrealized losses | $ (2,885) | $ (192)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 80 | 51
Fair value | $ 744 | $ 415
Unrealized losses | $ (27) | $ (6)
12 months or more |  |
Number of issues | contract | 42 | 4
Fair value | $ 141 | $ 3
Unrealized losses | (16) | 0
Total unrealized losses |  |
Total unrealized losses | $ (43) | $ (6)
ABS |  |
Less than 12 months |  |
Number of issues | contract | 269 | 80
Fair value | $ 1,484 | $ 500
Unrealized losses | $ (58) | $ (2)
12 months or more |  |
Number of issues | contract | 62 | 53
Fair value | $ 36 | $ 8
Unrealized losses | (5) | 0
Total unrealized losses |  |
Total unrealized losses | $ (63) | $ (2)
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 6,977 | 2,207
Fair value | $ 36,319 | $ 17,304
Unrealized losses | $ (3,021) | $ (223)
12 months or more |  |
Number of issues | contract | 961 | 85
Fair value | $ 4,825 | $ 227
Unrealized losses | (744) | (19)
Total unrealized losses |  |
Total unrealized losses | $ (3,765) | $ (242)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 6,313 | 1,993
Fair value | $ 32,385 | $ 15,391
Unrealized losses | $ (2,346) | $ (188)
12 months or more |  |
Number of issues | contract | 902 | 71
Fair value | $ 4,474 | $ 183
Unrealized losses | (643) | (8)
Total unrealized losses |  |
Total unrealized losses | $ (2,989) | $ (196)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 664 | 214
Fair value | $ 3,934 | $ 1,913
Unrealized losses | $ (675) | $ (35)
12 months or more |  |
Number of issues | contract | 59 | 14
Fair value | $ 351 | $ 44
Unrealized losses | (101) | (11)
Total unrealized losses |  |
Total unrealized losses | $ (776) | $ (46)

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