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Investments (Tax Equity Investments - Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Carrying Value of Tax Equity Investments | $ 661 |  | $ 661 |  | $ 714
Income Tax credits and other income tax benefits | 31 | $ 38 | 59 | $ 75 |
Tax Equity Investments Amortization Expense | $ 34 | $ 34 | $ 57 | $ 67 |

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