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Marketable and Other Securities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Marketable Securities [Abstract]        
Sale proceeds from investments classified as available-for-sale and sold prior to maturity $ 621 $ 584 $ 2,200 $ 1,100