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Investments - Net investment income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net investment income |  |  |
Investment income, before expense | $ 3,514 | $ 3,613 | $ 3,213
Investment expense | (274) | (212) | (171)
Net investment income | 3,240 | 3,401 | 3,042
Net investment income | (691) | 0 | 0
Fixed income securities |  |  |
Net investment income |  |  |
Investment income, before expense | 2,077 | 2,078 | 2,060
Equity securities |  |  |
Net investment income |  |  |
Investment income, before expense | 170 | 174 | 137
Mortgage loans |  |  |
Net investment income |  |  |
Investment income, before expense | 217 | 206 | 217
Limited partnership interests |  |  |
Net investment income |  |  |
Investment income, before expense | 705 | 889 | 561
Net investment income | 254 |  |
Short-term investments |  |  |
Net investment income |  |  |
Investment income, before expense | 73 | 30 | 16
Other |  |  |
Net investment income |  |  |
Investment income, before expense | 272 | $ 236 | $ 222
EMA limited partnerships | Limited partnership interests |  |  |
Net investment income |  |  |
Investment income, before expense | $ 451 |  |

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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