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Investments - Equity Securities At Fair Value (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity securities, at fair value | $ 14,114 |  | $ 14,114 |  | $ 13,832
Equity securities |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity method investment | 4,610 |  | 4,610 |  | $ 5,040
Fair value option |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Gains/(losses) recognized on equity securities | $ 0 | $ 0 | $ (97) | $ (107) |
Corporate Equity Securities |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Percentage of investment in equity securities | 77.00% |  | 77.00% |  | 75.00%
Real estate |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Percentage of investment in equity securities | 23.00% |  | 23.00% |  | 25.00%
Corporate and Real estate |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Percentage of investment in equity securities | 100.00% |  | 100.00% |  | 100.00%
Public and Private equity |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Percentage of investment in equity securities | 100.00% |  | 100.00% |  | 100.00%
Public equity |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Percentage of investment in equity securities | 3.00% |  | 3.00% |  | 6.00%
Private equity |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Percentage of investment in equity securities | 97.00% |  | 97.00% |  | 94.00%

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