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Investments (Collectively Significant Equity Method Investments - Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments | $ 24,900 |  |
Unfunded Commitments For Investments Accounted For Under Equity Method | 5,800 |  |
Total Assets | 677,457 | $ 687,584 |
Total Liabilities | 649,754 | 657,331 |
Net income (loss) | 4,444 | 1,602 | $ 5,302
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 1,300,000 | 1,200,000 |
Total Liabilities | 154,100 | 148,000 |
Net income (loss) | $ 63,700 | $ 32,800 | $ (11,800)

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