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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, 2021 USD ($) contract | Dec. 31, 2020 USD ($) contract
--- | --- | ---
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 108 | 26
Fair value | $ 2,084 | $ 215
Unrealized losses | $ (19) | $ (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 | $ (19) | $ (1)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 804 | 43
Fair value | $ 1,398 | $ 116
Unrealized losses | $ (36) | $ (2)
12 months or more |  |
Number of issues | contract | 1 | 0
Fair value | $ 5 | $ 0
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | $ (36) | $ (2)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 1,003 | 107
Fair value | $ 6,715 | $ 730
Unrealized losses | $ (176) | $ (21)
12 months or more |  |
Number of issues | contract | 25 | 14
Fair value | $ 121 | $ 46
Unrealized losses | (11) | (5)
Total unrealized losses |  |
Total unrealized losses | $ (187) | $ (26)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 64 | 7
Fair value | $ 289 | $ 7
Unrealized losses | $ (8) | $ 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 | $ (8) | $ 0
ABS |  |
Less than 12 months |  |
Number of issues | contract | 15 | 21
Fair value | $ 79 | $ 157
Unrealized losses | $ (2) | $ (2)
12 months or more |  |
Number of issues | contract | 13 | 12
Fair value | $ 50 | $ 43
Unrealized losses | 0 | (1)
Total unrealized losses |  |
Total unrealized losses | $ (2) | $ (3)
MBS |  |
Less than 12 months |  |
Number of issues | contract | 15 | 11
Fair value | $ 2 | $ 0
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 55 | 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 | 2,009 | 215
Fair value | $ 10,567 | $ 1,225
Unrealized losses | $ (241) | $ (26)
12 months or more |  |
Number of issues | contract | 94 | 83
Fair value | $ 176 | $ 89
Unrealized losses | (11) | (6)
Total unrealized losses |  |
Total unrealized losses | $ (252) | $ (32)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 1,821 | 146
Fair value | $ 9,206 | $ 855
Unrealized losses | $ (207) | $ (8)
12 months or more |  |
Number of issues | contract | 69 | 66
Fair value | $ 67 | $ 45
Unrealized losses | (1) | 0
Total unrealized losses |  |
Total unrealized losses | $ (208) | $ (8)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 188 | 69
Fair value | $ 1,361 | $ 370
Unrealized losses | $ (34) | $ (18)
12 months or more |  |
Number of issues | contract | 25 | 17
Fair value | $ 109 | $ 44
Unrealized losses | (10) | (6)
Total unrealized losses |  |
Total unrealized losses | $ (44) | $ (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=121582814&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=121645371&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=121645371&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=121582814&loc=SL82922890-210455 + Details
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- Definition Number of investments in debt securities 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 an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + 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 less 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=121582814&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=121645371&loc=d3e27337-111563 + Details
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