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Investments - Net investment income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Net Investment Income: |  |  |  |
Investment income, before expense | $ 681 | $ 618 | $ 1,331 | $ 1,263
Investment expense | (71) | (56) | (146) | (107)
Net investment income | 610 | 562 | 1,185 | 1,156
Fixed income securities |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 422 | 299 | 812 | 566
Equity securities |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 21 | 34 | 32 | 70
Mortgage loans |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 8 | 9 | 16 | 17
Limited partnership interests |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 122 | 224 | 256 | 516
Short-term investments |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 69 | 10 | 135 | 12
Other investments |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | $ 39 | $ 42 | $ 80 | $ 82

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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/2009/role/commonPracticeRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 45 -Paragraph 39 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480228/946-830-45-39 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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