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Acquisitions and Sale of Businesses - Impact of exited lines on earnings (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net investment income |  |  | $ 730 | $ 461 | $ 532
Net earnings, including noncontrolling interests |  |  | 1,995 | 721 | 869
Realized gains on subsidiaries |  |  | 4 | 23 | 0
Income tax expense (benefit) |  |  | (254) | (25) | (143)
Less: Net loss attributable to noncontrolling interests |  |  | $ 0 | 11 | 28
Neon Capital Limited |  |  |  |  |
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Underwriting loss |  |  |  | (135) | (36)
Net investment income |  |  |  | (5) | 6
Other income and expenses, net |  |  |  | (5) | (10)
Net earnings, including noncontrolling interests |  |  |  | (145) | $ (40)
Realized gains on subsidiaries | $ 4 | $ 23 |  | 23 |
Total pretax loss from Neon exited lines |  |  |  | (122) |
Income tax expense (benefit) |  |  |  | 72 |
Less: Net loss attributable to noncontrolling interests |  |  |  | (11) |
Net loss from Neon exited lines attributable to shareholders |  |  |  | $ (39) |

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