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Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Realized capital gains and losses by asset type |  |
Realized capital gains and losses | $ (134) | $ 134
Fixed income securities |  |
Realized capital gains and losses by asset type |  |
Realized capital gains and losses | (43) | 5
Equity securities |  |
Realized capital gains and losses by asset type |  |
Realized capital gains and losses | (93) | 106
Limited partnership interests |  |
Realized capital gains and losses by asset type |  |
Realized capital gains and losses | 10 | 40
Derivatives |  |
Realized capital gains and losses by asset type |  |
Realized capital gains and losses | (8) | (15)
Other |  |
Realized capital gains and losses by asset type |  |
Realized capital gains and losses | $ 0 | $ (2)

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031664&loc=d3e22529-158502 + 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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