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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 | Dec. 31, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract
--- | --- | ---
Total unrealized losses |  |
Total unrealized losses | $ (1) |
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 23 | 31
Fair value | $ 185 | $ 1,713
Unrealized losses | $ (1) | $ (26)
12 months or more |  |
Number of issues | contract | 0 | 10
Fair value | $ 0 | $ 26
Unrealized losses | $ 0 | 0
Total unrealized losses |  |
Total unrealized losses |  | $ (26)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 47 | 307
Fair value | $ 148 | $ 576
Unrealized losses | $ (2) | $ (9)
12 months or more |  |
Number of issues | contract | 0 | 1
Fair value | $ 0 | $ 14
Unrealized losses | 0 | (2)
Total unrealized losses |  |
Total unrealized losses | $ (2) | $ (11)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 127 | 186
Fair value | $ 1,229 | $ 1,392
Unrealized losses | $ (39) | $ (20)
12 months or more |  |
Number of issues | contract | 27 | 65
Fair value | $ 187 | $ 485
Unrealized losses | (26) | (27)
Total unrealized losses |  |
Total unrealized losses | $ (65) | $ (47)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 7 | 55
Fair value | $ 7 | $ 412
Unrealized losses | $ 0 | $ (4)
12 months or more |  |
Number of issues | contract | 0 | 6
Fair value | $ 0 | $ 102
Unrealized losses | 0 | (1)
Total unrealized losses |  |
Total unrealized losses | $ 0 | $ (5)
ABS |  |
Less than 12 months |  |
Number of issues | contract | 22 | 36
Fair value | $ 160 | $ 193
Unrealized losses | $ (2) | $ (2)
12 months or more |  |
Number of issues | contract | 13 | 23
Fair value | $ 49 | $ 160
Unrealized losses | (3) | (4)
Total unrealized losses |  |
Total unrealized losses | $ (5) | $ (6)
Mortgage-backed securities |  |
Less than 12 months |  |
Number of issues | contract | 14 | 27
Fair value | $ 0 | $ 15
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 67 | 123
Fair value | $ 0 | $ 14
Unrealized losses | 0 | (1)
Total unrealized losses |  |
Total unrealized losses | $ 0 | $ (1)
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 240 | 642
Fair value | $ 1,729 | $ 4,301
Unrealized losses | $ (44) | $ (61)
12 months or more |  |
Number of issues | contract | 107 | 228
Fair value | $ 236 | $ 801
Unrealized losses | (29) | (35)
Total unrealized losses |  |
Total unrealized losses | $ (73) | $ (96)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 163 | 581
Fair value | $ 1,193 | $ 3,878
Unrealized losses | $ (13) | $ (41)
12 months or more |  |
Number of issues | contract | 84 | 185
Fair value | $ 117 | $ 594
Unrealized losses | (17) | (20)
Total unrealized losses |  |
Total unrealized losses | $ (30) | $ (61)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 77 | 61
Fair value | $ 536 | $ 423
Unrealized losses | $ (31) | $ (20)
12 months or more |  |
Number of issues | contract | 23 | 43
Fair value | $ 119 | $ 207
Unrealized losses | (12) | (15)
Total unrealized losses |  |
Total unrealized losses | $ (43) | $ (35)

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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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