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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | $ 176 | $ 103 | $ 17 | $ 318
Fixed income securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | (30) | 41 | (153) | 78
Equity securities |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 223 | 57 | 204 | 182
Mortgage loans |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 0 | 1 | 2 | 1
Limited partnership interests |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | (23) | 21 | (56) | 92
Derivatives |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | 5 | (17) | 20 | (40)
Other |  |  |  |
Realized capital gains and losses by asset type |  |  |  |
Realized capital gains and losses | $ 1 | $ 0 | $ 0 | $ 5

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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=114873790&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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