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Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Variable Interest Entity [Line Items] |  |  |  |  |
Other comprehensive income (loss), net of tax | $ 1,687 | $ (3,376) | $ 794 | $ (2,128) |
Other investments | 5,743 |  | 5,743 |  | $ 5,015
Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Other comprehensive income (loss), net of tax | 0 | $ 0 | 0 | $ 0 |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Other investments | $ 5,000 |  | $ 5,000 |  | $ 4,200

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