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Short-Term Borrowings and Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Debt Instrument [Line Items]    
Par Value   $ 3,000
Commercial Paper    
Debt Instrument [Line Items]    
Commercial Paper $ 2,900  
Debt Instrument, Interest Rate, Effective Percentage 4.20%