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Derivatives (Cash Flow Hedges) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net | $ 2 | $ 4 | $ 14 | $ (6) |
Accumulated Other Comprehensive Income Loss | $ (1,900) |  | $ (1,900) |  | $ 357
Derivatives in cash flow hedging relationships |  |  |  |  |
Maximum Length of Time Hedged in Cash Flow Hedge |  |  | 4 years |  | 4 years

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