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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | $ (462) | $ 662
Fixed income securities |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | 375 | 64
Equity securities |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | (750) | 553
Mortgage loans |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | (41) | 0
Limited partnership interests |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | (116) | 72
Derivatives |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | 88 | (46)
Other |  |
Realized capital gains and losses by asset type |  |
Realized capital gains (losses) | $ (18) | $ 19

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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + 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=116637232&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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