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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | $ 704 | $ 324 | $ 242 | $ 986
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 187 | 79 | 562 | 143
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 480 | 178 | (270) | 731
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 0 | 0 | (41) | 0
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 33 | 21 | (83) | 93
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 18 | 22 | 106 | (24)
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | $ (14) | $ 24 | $ (32) | $ 43

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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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