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Investments (Tax Equity Investments - Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |
Carrying Value of Tax Equity Investments | $ 737 | $ 737 | $ 1,000
Income Tax credits and other income tax benefits | 37 | 112 |
Tax Equity Investments Amortization Expense | $ 33 | $ 100 |

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