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Acquisitions and Sale of Businesses - Revenues, costs and expenses, and earnings before income taxes of business disposed (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net earned premiums | $ 5,404 | $ 5,099 | $ 5,185
Loss and loss adjustment expenses | 3,157 | 3,271 | 3,271
Commissions and other underwriting expenses | 1,547 | 1,625 | 1,725
Net investment income | 730 | 461 | 532
Net earnings, including noncontrolling interests | $ 1,995 | 721 | 869
Neon Capital Limited |  |  |
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net earned premiums |  | 200 | 384
Loss and loss adjustment expenses |  | 218 | 225
Commissions and other underwriting expenses |  | 117 | 195
Underwriting loss |  | (135) | (36)
Net investment income |  | (5) | 6
Other income and expenses, net |  | (5) | (10)
Net earnings, including noncontrolling interests |  | $ (145) | $ (40)

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