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Acquisitions (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Jul. 01, 2023 | Jun. 30, 2023
Huatai Group |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Subsidiary, Ownership Percentage, Parent | 85.50% | 76.50% | 69.60% |
Additional 9.0 percent ownership interest obtained in subsidiary | 9.00% |  |  |
Outstanding 0.6 percent additional ownership interest agreed on | 0.60% |  |  |
Huatai Group |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 64.20%
Huatai Group |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries | $ 236 |  |  |
Deposits previously paid on additional ownership interest obtained | 319 |  |  |
Deposits previously paid on additional ownership interest agreed on | 12 |  |  |
Outstanding payment to be made on additional ownership interest agreed on | 24 |  |  |
Payment on additional ownership interest obtained, including deposits previously paid | $ 555 |  |  |

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