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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | $ 440 | $ 197 | $ 682 | $ 1,183
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 236 | 147 | 798 | 290
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 202 | 40 | (68) | 771
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 1 | 0 | (40) | 0
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | 30 | (18) | (53) | 75
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | (34) | 40 | 72 | 16
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains (losses) | $ 5 | $ (12) | $ (27) | $ 31

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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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