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Commercial Paper and Long-Term Debt - Schedule of Unsecured Long-Term Debt Issuances (Details) - Unsecured Debt - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Unsecured Fixed Rate 5.0% Maturing 2035    
Debt Instrument [Line Items]    
Principal Amount   $ 1,000
Interest Rate (Fixed)   5.00%
Unsecured Fixed Rate 4.35% Maturing 2028    
Debt Instrument [Line Items]    
Principal Amount $ 500  
Interest Rate (Fixed) 4.35%  
Unsecured Fixed Rate 5.25% Maturing 2036    
Debt Instrument [Line Items]    
Principal Amount $ 500  
Interest Rate (Fixed) 5.25%