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Investments (Collectively Significant Equity Method Investments - Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments | $ 25,200 |  |  |  |  |  |  |  | $ 25,200 |  |
Unfunded Commitments For Investments Accounted For Under Equity Method | 6,700 |  |  |  |  |  |  |  | 6,700 |  |
Total Assets | 687,584 |  |  |  | $ 663,072 |  |  |  | 687,584 | $ 663,072 |
Total Liabilities | 657,331 |  |  |  | 632,947 |  |  |  | 657,331 | 632,947 |
Net income (loss) | 614 | $ 495 | $ 408 | $ 85 | 1,581 | $ 1,167 | $ 915 | $ 1,639 | 1,602 | 5,302 | $ 6,876
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 1,200,000 |  |  |  | 1,200,000 |  |  |  | 1,200,000 | 1,200,000 |
Total Liabilities | $ 148,000 |  |  |  | $ 148,900 |  |  |  | 148,000 | 148,900 |
Net income (loss) |  |  |  |  |  |  |  |  | $ 32,800 | $ (11,800) | $ 231,000

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