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Marketable and Other Securities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Marketable Securities [Abstract] |  |  |  |
Sale proceeds from investments classified as available-for-sale and sold prior to maturity | $ 547 | $ 580 | $ 2,700 | $ 1,600
Net unrealized losses on available-for-sale debt securities |  | $ 159 |  | $ 160

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