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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | $ (877) | $ 445 | $ (90)
Fixed income securities |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | (237) | 94 | (91)
Equity securities |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | (594) | 255 | 23
Mortgage loans |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | 2 | 1 | 0
Limited partnership interests |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | (101) | 132 | (21)
Derivatives |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | 46 | (46) | 3
Other |  |  |
Realized capital gains and losses by asset type |  |  |
Realized capital gains and losses | $ 7 | $ 9 | $ (4)

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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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