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Marketable and Other Securities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Marketable Securities [Abstract] |  |  |  |  |
Sale proceeds from investments classified as available-for-sale and sold prior to maturity | $ 454 | $ 441 | $ 1,500 | $ 1,400 |
Net unrealized losses on available-for-sale debt securities |  |  |  | $ 367 |
Cumulative unrealized losses on available-for-sale debt securities | $ 293 |  | $ 293 |  | $ 344

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