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Marketable and Other Securities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Marketable Securities [Abstract] |  |  |  |  |
Sale proceeds from investments classified as available-for-sale and sold prior to maturity | $ 638 | $ 494 | $ 1,000 | $ 1,000 |
Net unrealized losses on available-for-sale debt securities |  |  |  | $ 261 |
Cumulative unrealized losses on available-for-sale debt securities | $ 303 |  | $ 303 |  | $ 344

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