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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, 2021 USD ($) contract | Dec. 31, 2020 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 109 | 26
Fair value | $ 3,926 | $ 215
Unrealized losses | $ (15) | $ (1)
12 months or more |  |
Number of issues | contract | 0 | 0
Fair value | $ 0 | $ 0
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ (15) | $ (1)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 479 | 43
Fair value | $ 800 | $ 116
Unrealized losses | $ (9) | $ (2)
12 months or more |  |
Number of issues | contract | 1 | 0
Fair value | $ 4 | $ 0
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ (9) | $ (2)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 749 | 107
Fair value | $ 4,868 | $ 730
Unrealized losses | $ (71) | $ (21)
12 months or more |  |
Number of issues | contract | 16 | 14
Fair value | $ 61 | $ 46
Unrealized losses | (14) | (5)
Total unrealized losses |  |
Total unrealized losses | $ (85) | $ (26)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 50 | 7
Fair value | $ 224 | $ 7
Unrealized losses | $ (5) | $ 0
12 months or more |  |
Number of issues | contract | 0 | 0
Fair value | $ 0 | $ 0
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ (5) | $ 0
ABS |  |
Less than 12 months |  |
Number of issues | contract | 23 | 21
Fair value | $ 198 | $ 157
Unrealized losses | $ (1) | $ (2)
12 months or more |  |
Number of issues | contract | 8 | 12
Fair value | $ 15 | $ 43
Unrealized losses | 0 | (1)
Total unrealized losses |  |
Total unrealized losses | $ (1) | $ (3)
MBS |  |
Less than 12 months |  |
Number of issues | contract | 18 | 11
Fair value | $ 2 | $ 0
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 50 | 57
Fair value | $ 0 | $ 0
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ 0 | $ 0
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 1,428 | 215
Fair value | $ 10,018 | $ 1,225
Unrealized losses | $ (101) | $ (26)
12 months or more |  |
Number of issues | contract | 75 | 83
Fair value | $ 80 | $ 89
Unrealized losses | (14) | (6)
Total unrealized losses |  |
Total unrealized losses | $ (115) | $ (32)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 1,316 | 146
Fair value | $ 9,205 | $ 855
Unrealized losses | $ (85) | $ (8)
12 months or more |  |
Number of issues | contract | 59 | 66
Fair value | $ 16 | $ 45
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ (85) | $ (8)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 112 | 69
Fair value | $ 813 | $ 370
Unrealized losses | $ (16) | $ (18)
12 months or more |  |
Number of issues | contract | 16 | 17
Fair value | $ 64 | $ 44
Unrealized losses | (14) | (6)
Total unrealized losses |  |
Total unrealized losses | $ (30) | $ (24)

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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 http://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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, 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 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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