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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, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract
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U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract |  | 31
Fair value |  | $ 1,713
Unrealized losses |  | $ (26)
12 months or more |  |
Number of issues | contract |  | 10
Fair value |  | $ 26
Unrealized losses |  | 0
Total unrealized losses |  |
Total unrealized losses |  | $ (26)
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 470 | 307
Fair value | $ 1,029 | $ 576
Unrealized losses | $ (28) | $ (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 | $ (28) | $ (11)
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 1,838 | 186
Fair value | $ 18,525 | $ 1,392
Unrealized losses | $ (1,161) | $ (20)
12 months or more |  |
Number of issues | contract | 31 | 65
Fair value | $ 187 | $ 485
Unrealized losses | (70) | (27)
Total unrealized losses |  |
Total unrealized losses | $ (1,231) | $ (47)
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 25 | 55
Fair value | $ 85 | $ 412
Unrealized losses | $ (3) | $ (4)
12 months or more |  |
Number of issues | contract | 1 | 6
Fair value | $ 6 | $ 102
Unrealized losses | 0 | (1)
Total unrealized losses |  |
Total unrealized losses | $ (3) | $ (5)
ABS |  |
Less than 12 months |  |
Number of issues | contract | 63 | 36
Fair value | $ 383 | $ 193
Unrealized losses | $ (13) | $ (2)
12 months or more |  |
Number of issues | contract | 13 | 23
Fair value | $ 61 | $ 160
Unrealized losses | (6) | (4)
Total unrealized losses |  |
Total unrealized losses | $ (19) | $ (6)
MBS |  |
Less than 12 months |  |
Number of issues | contract | 35 | 27
Fair value | $ 33 | $ 15
Unrealized losses | $ (3) | $ 0
12 months or more |  |
Number of issues | contract | 101 | 123
Fair value | $ 7 | $ 14
Unrealized losses | 0 | (1)
Total unrealized losses |  |
Total unrealized losses | $ (3) | $ (1)
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 2,431 | 642
Fair value | $ 20,055 | $ 4,301
Unrealized losses | $ (1,208) | $ (61)
12 months or more |  |
Number of issues | contract | 146 | 228
Fair value | $ 261 | $ 801
Unrealized losses | (76) | (35)
Total unrealized losses |  |
Total unrealized losses | $ (1,284) | $ (96)
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 1,816 | 581
Fair value | $ 15,130 | $ 3,878
Unrealized losses | $ (689) | $ (41)
12 months or more |  |
Number of issues | contract | 116 | 185
Fair value | $ 130 | $ 594
Unrealized losses | (27) | (20)
Total unrealized losses |  |
Total unrealized losses | $ (716) | $ (61)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 615 | 61
Fair value | $ 4,925 | $ 423
Unrealized losses | $ (519) | $ (20)
12 months or more |  |
Number of issues | contract | 30 | 43
Fair value | $ 131 | $ 207
Unrealized losses | (49) | (15)
Total unrealized losses |  |
Total unrealized losses | $ (568) | $ (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=118955579&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=118939692&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=118942371&loc=SL82922954-210456 + Details
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