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Investments - Schedule of sources of net investment income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Net Investment Income [Line Items] |  |  |  |
Investment income | $ 578 | $ 593 | $ 1,601 | $ 1,727
Equity in earnings of partnerships and similar investments | 66 | 43 | 37 | 109
Investment expenses | (6) | (5) | (17) | (17)
Net Investment Income, Total | 572 | 588 | 1,584 | 1,710
Fixed maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 473 | 475 | 1,449 | 1,422
Other |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 26 | 36 | 72 | 95
Accounting Standards Update 2016-01 | Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | (3) | 17 | (6) | 35
Investment income | Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | $ 16 | $ 22 | $ 49 | $ 66

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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