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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Fair Value Disclosures [Abstract] |  |
Gain on sale of marketable securities | $ 36 | $ 13

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- Definition Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). + References No definition available. + Details
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