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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | $ 324 | $ (25) | $ 986 | $ (159)
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 79 | (80) | 143 | (123)
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 178 | 74 | 731 | (19)
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 0 | 2 | 0 | 2
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 21 | (43) | 93 | (33)
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 22 | 23 | (24) | 15
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | $ 24 | $ (1) | $ 43 | $ (1)

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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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