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Investments - Schedule of Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Net Investment Income: |  |  |  |
Investment income, before expense | $ 771 | $ 754 | $ 2,102 | $ 2,017
Investment expense | (82) | (64) | (228) | (171)
Net investment income | 689 | 690 | 1,874 | 1,846
Fixed income securities |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 457 | 323 | 1,269 | 889
Equity securities |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 15 | 30 | 47 | 100
Mortgage loans |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 9 | 8 | 25 | 25
Limited partnership interests |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 190 | 325 | 446 | 841
Short-term investments |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | 59 | 30 | 194 | 42
Other investments |  |  |  |
Net Investment Income: |  |  |  |
Investment income, before expense | $ 41 | $ 38 | $ 121 | $ 120

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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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