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Investments - Schedule of sources of net investment income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net Investment Income [Line Items] |  |  |
Investment income | $ 742 | $ 467 | $ 538
Equity in earnings of partnerships and similar investments | 321 | 99 | 97
Investment expenses | (12) | (6) | (6)
Net investment income | 730 | 461 | 532
Investment income |  |  |
Net Investment Income [Line Items] |  |  |
Change in fair value of equity securities | 61 | 7 | 22
Fixed maturities |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 290 | 303 | 315
Other |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | 40 | 23 | 53
Investment income | Equity securities |  |  |
Net Investment Income [Line Items] |  |  |
Investment income | $ 30 | $ 35 | $ 51

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714 + Details
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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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