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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | $ 1,885 | $ (877) | $ 445
Fixed income securities |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | 461 | (237) | 94
Equity securities |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | 1,210 | (594) | 255
Mortgage loans |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | 0 | 2 | 1
Limited partnership interests |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | 200 | (101) | 132
Derivatives |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | (15) | 46 | (46)
Other |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | $ 29 | $ 7 | $ 9

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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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