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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 | Mar. 31, 2022 USD ($) contract | Dec. 31, 2021 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 140 | 112
Fair value | $ 5,954 | $ 5,451
Unrealized losses | $ (119) | $ (24)
12 months or more |  |
Number of issues | contract | 18 | 4
Fair value | $ 247 | $ 72
Unrealized losses | (12) | (2)
Total unrealized losses |  |
Total unrealized losses | $ (131) | $ (26)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 2,523 | 767
Fair value | $ 3,145 | $ 1,213
Unrealized losses | $ (155) | $ (15)
12 months or more |  |
Number of issues | contract | 49 | 2
Fair value | $ 68 | $ 14
Unrealized losses | (6) | (1)
Total unrealized losses |  |
Total unrealized losses | $ (161) | $ (16)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 2,177 | 1,197
Fair value | $ 18,250 | $ 9,725
Unrealized losses | $ (988) | $ (176)
12 months or more |  |
Number of issues | contract | 281 | 22
Fair value | $ 1,170 | $ 130
Unrealized losses | (130) | (16)
Total unrealized losses |  |
Total unrealized losses | $ (1,118) | $ (192)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 87 | 51
Fair value | $ 922 | $ 415
Unrealized losses | $ (29) | $ (6)
12 months or more |  |
Number of issues | contract | 34 | 4
Fair value | $ 116 | $ 3
Unrealized losses | (11) | 0
Total unrealized losses |  |
Total unrealized losses | $ (40) | $ (6)
ABS |  |
Less than 12 months |  |
Number of issues | contract | 175 | 80
Fair value | $ 1,917 | $ 500
Unrealized losses | $ (21) | $ (2)
12 months or more |  |
Number of issues | contract | 56 | 53
Fair value | $ 11 | $ 8
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ (21) | $ (2)
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 5,102 | 2,207
Fair value | $ 30,188 | $ 17,304
Unrealized losses | $ (1,312) | $ (223)
12 months or more |  |
Number of issues | contract | 438 | 85
Fair value | $ 1,612 | $ 227
Unrealized losses | (159) | (19)
Total unrealized losses |  |
Total unrealized losses | $ (1,471) | $ (242)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 4,498 | 1,993
Fair value | $ 25,027 | $ 15,391
Unrealized losses | $ (1,014) | $ (188)
12 months or more |  |
Number of issues | contract | 421 | 71
Fair value | $ 1,554 | $ 183
Unrealized losses | (148) | (8)
Total unrealized losses |  |
Total unrealized losses | $ (1,162) | $ (196)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 604 | 214
Fair value | $ 5,161 | $ 1,913
Unrealized losses | $ (298) | $ (35)
12 months or more |  |
Number of issues | contract | 17 | 14
Fair value | $ 58 | $ 44
Unrealized losses | (11) | (11)
Total unrealized losses |  |
Total unrealized losses | $ (309) | $ (46)

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