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Investments - Gross unrealized losses on securities by investment category and length of time that have been in a continuous unrealized loss position (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Fixed maturities |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized loss - less than twelve months | $ (23) | $ (14)
Fair value - less than twelve months | $ 3,270 | $ 952
Fair value as percentage of cost - less than twelve months | 99.00% | 99.00%
Unrealized loss - twelve months or more | $ (5) | $ (7)
Fair value - twelve months or more | $ 226 | $ 497
Fair value as a percentage of cost - twelve months or more | 98.00% | 99.00%
U.S. Government and government agencies |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized loss - less than twelve months | $ (1) | $ 0
Fair value - less than twelve months | $ 92 | $ 23
Fair value as percentage of cost - less than twelve months | 99.00% | 100.00%
Unrealized loss - twelve months or more | $ (1) | $ 0
Fair value - twelve months or more | $ 22 | $ 0
Fair value as a percentage of cost - twelve months or more | 96.00% | 0.00%
States, municipalities and political subdivisions |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized loss - less than twelve months | $ 0 | $ 0
Fair value - less than twelve months | $ 9 | $ 39
Fair value as percentage of cost - less than twelve months | 100.00% | 100.00%
Unrealized loss - twelve months or more | $ 0 | $ 0
Fair value - twelve months or more | $ 13 | $ 10
Fair value as a percentage of cost - twelve months or more | 100.00% | 100.00%
Foreign government |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized loss - less than twelve months | $ (2) | $ 0
Fair value - less than twelve months | $ 160 | $ 7
Fair value as percentage of cost - less than twelve months | 99.00% | 100.00%
Unrealized loss - twelve months or more | $ 0 | $ 0
Fair value - twelve months or more | $ 0 | $ 0
Fair value as a percentage of cost - twelve months or more | 0.00% | 0.00%
Residential MBS |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized loss - less than twelve months | $ (3) | $ (1)
Fair value - less than twelve months | $ 419 | $ 86
Fair value as percentage of cost - less than twelve months | 99.00% | 99.00%
Unrealized loss - twelve months or more | $ 0 | $ 0
Fair value - twelve months or more | $ 7 | $ 7
Fair value as a percentage of cost - twelve months or more | 100.00% | 100.00%
Commercial MBS |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized loss - less than twelve months | $ 0 | $ 0
Fair value - less than twelve months | $ 34 | $ 7
Fair value as percentage of cost - less than twelve months | 100.00% | 100.00%
Unrealized loss - twelve months or more | $ 0 | $ 0
Fair value - twelve months or more | $ 0 | $ 5
Fair value as a percentage of cost - twelve months or more | 0.00% | 100.00%
Collateralized loan obligations |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized loss - less than twelve months | $ (1) | $ (1)
Fair value - less than twelve months | $ 806 | $ 192
Fair value as percentage of cost - less than twelve months | 100.00% | 99.00%
Unrealized loss - twelve months or more | $ (1) | $ (3)
Fair value - twelve months or more | $ 77 | $ 366
Fair value as a percentage of cost - twelve months or more | 99.00% | 99.00%
Other asset-backed securities |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized loss - less than twelve months | $ (8) | $ (10)
Fair value - less than twelve months | $ 1,250 | $ 465
Fair value as percentage of cost - less than twelve months | 99.00% | 98.00%
Unrealized loss - twelve months or more | $ (3) | $ (3)
Fair value - twelve months or more | $ 81 | $ 92
Fair value as a percentage of cost - twelve months or more | 96.00% | 97.00%
Corporate and other |  |
Available-for-sale securities in a continuous unrealized loss position |  |
Unrealized loss - less than twelve months | $ (8) | $ (2)
Fair value - less than twelve months | $ 500 | $ 133
Fair value as percentage of cost - less than twelve months | 98.00% | 99.00%
Unrealized loss - twelve months or more | $ 0 | $ (1)
Fair value - twelve months or more | $ 26 | $ 17
Fair value as a percentage of cost - twelve months or more | 100.00% | 94.00%

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- Definition Available for sale securities continuous unrealized loss position twelve months or longer fair value as percentage of cost. + References No definition available. + Details
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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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