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Fair Value Investment in Marketable Securities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Gain Loss On Marketable Securities        
Gross proceeds from sales of AFS securities $ 1 $ 1 $ 2 $ 4