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Investments (Details 3) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Net Investment Income: |  |  |  |
Investment income, before expense | $ 898 | $ 790 | $ 2,642 | $ 2,368
Investment expense | (55) | (42) | (154) | (127)
Net investment income | 843 | 748 | 2,488 | 2,241
Fixed income securities |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 519 | 508 | 1,564 | 1,546
Equity securities |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 37 | 31 | 130 | 103
Mortgage loans |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 52 | 56 | 157 | 162
Limited partnership interests |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 223 | 136 | 596 | 383
Short-term investments |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 9 | 4 | 21 | 11
Other |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | $ 58 | $ 55 | $ 174 | $ 163

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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