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Investments - Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized gains (losses) on securities | $ (93) | $ 43 | $ (108) | $ 120
Net of tax |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | (72) | 34 | (86) | 94
Realized — impairments | (1) | 0 | 1 | 1
Realized gains (losses) on securities | (73) | 34 | (85) | 95
Change in unrealized | (217) | 16 | (462) | (19)
Total pretax |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | (92) | 43 | (109) | 119
Realized — impairments | (1) | 0 | 1 | 1
Realized gains (losses) on securities | (93) | 43 | (108) | 120
Change in unrealized | (275) | 20 | (586) | (24)
Fixed maturities |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | (10) | 1 | (14) | 0
Realized — impairments | (1) | 0 | 1 | 1
Realized gains (losses) on securities | (11) | 1 | (13) | 1
Change in unrealized | (275) | 20 | (586) | (24)
Equity securities |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | (82) | 42 | (95) | 119
Realized — impairments | 0 | 0 | 0 | 0
Realized gains (losses) on securities | (82) | 42 | (95) | 119
Change in unrealized | 0 | 0 | 0 | 0
Mortgage loans and other investments |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 0 | 0 | 0 | 0
Realized — impairments | 0 | 0 | 0 | 0
Realized gains (losses) on securities | 0 | 0 | 0 | 0
Change in unrealized | 0 | 0 | 0 | 0
Tax effects |  |  |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |  |  |
Realized before impairments | 20 | (9) | 23 | (25)
Realized — impairments | 0 | 0 | 0 | 0
Realized gains (losses) on securities | 20 | (9) | 23 | (25)
Change in unrealized | $ 58 | $ (4) | $ 124 | $ 5

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- Definition Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments. + References No definition available. + Details
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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI https://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562 + Details
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