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Fair Value Investment in Marketable Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Gain Loss On Marketable Securities        
Gross proceeds from sales of AFS securities $ 189 $ 308 $ 683 $ 1,047