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Acquisitions and Sale of Businesses - Narrative on sale of businesses (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale of businesses |  | $ 0 | $ 0 | $ 3,581 |
Realized gains on subsidiaries |  | $ (4) | $ 0 | $ 4 |
Neon Capital Limited |  |  |  |  |
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale of businesses | $ 10 |  |  |  | $ 6
Realized gains on subsidiaries | $ 4 |  |  |  |

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