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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | $ 4 | $ 1,356 | $ 1,885 | $ (877)
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) |  | 983 | 461 | (237)
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) |  | 346 | 1,210 | (594)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) |  | (47) | 0 | 2
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) |  | 24 | 200 | (101)
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) |  | 53 | (15) | 46
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) |  | $ (3) | $ 29 | $ 7

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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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