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Fair Value Investment in Marketable Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Gain Loss On Marketable Securities |  |  |  |
Gross proceeds from sales of AFS securities | $ 1 | $ 375 | $ 4 | $ 494
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax | $ (4) | $ (18) | $ (12) | $ (50)

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