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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, 2023 USD ($) contract | Dec. 31, 2022 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 70 | 112
Fair value | $ 2,576 | $ 4,900
Unrealized losses | $ (41) | $ (138)
12 months or more |  |
Number of issues | contract | 104 | 75
Fair value | $ 3,216 | $ 2,393
Unrealized losses | (111) | (93)
Total unrealized losses |  |
Total unrealized losses | $ (152) | $ (231)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 1,183 | 3,015
Fair value | $ 1,632 | $ 3,944
Unrealized losses | $ (27) | $ (215)
12 months or more |  |
Number of issues | contract | 1,860 | 507
Fair value | $ 2,376 | $ 740
Unrealized losses | (213) | (111)
Total unrealized losses |  |
Total unrealized losses | $ (240) | $ (326)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 970 | 2,085
Fair value | $ 8,673 | $ 18,072
Unrealized losses | $ (286) | $ (1,389)
12 months or more |  |
Number of issues | contract | 1,777 | 845
Fair value | $ 14,543 | $ 6,105
Unrealized losses | (1,501) | (956)
Total unrealized losses |  |
Total unrealized losses | $ (1,787) | $ (2,345)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 15 | 74
Fair value | $ 197 | $ 739
Unrealized losses | $ (1) | $ (22)
12 months or more |  |
Number of issues | contract | 87 | 42
Fair value | $ 452 | $ 200
Unrealized losses | (23) | (18)
Total unrealized losses |  |
Total unrealized losses | $ (24) | $ (40)
ABS |  |
Less than 12 months |  |
Number of issues | contract | 74 | 194
Fair value | $ 160 | $ 874
Unrealized losses | $ (5) | $ (27)
12 months or more |  |
Number of issues | contract | 152 | 83
Fair value | $ 669 | $ 109
Unrealized losses | (20) | (8)
Total unrealized losses |  |
Total unrealized losses | $ (25) | $ (35)
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 2,312 | 5,480
Fair value | $ 13,238 | $ 28,529
Unrealized losses | $ (360) | $ (1,791)
12 months or more |  |
Number of issues | contract | 3,980 | 1,552
Fair value | $ 21,256 | $ 9,547
Unrealized losses | (1,868) | (1,186)
Total unrealized losses |  |
Total unrealized losses | $ (2,228) | $ (2,977)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 2,132 | 4,959
Fair value | $ 12,415 | $ 25,487
Unrealized losses | $ (313) | $ (1,409)
12 months or more |  |
Number of issues | contract | 3,601 | 1,437
Fair value | $ 18,633 | $ 8,791
Unrealized losses | (1,509) | (1,009)
Total unrealized losses |  |
Total unrealized losses | $ (1,822) | $ (2,418)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 180 | 521
Fair value | $ 823 | $ 3,042
Unrealized losses | $ (47) | $ (382)
12 months or more |  |
Number of issues | contract | 379 | 115
Fair value | $ 2,623 | $ 756
Unrealized losses | (359) | (177)
Total unrealized losses |  |
Total unrealized losses | $ (406) | $ (559)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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