Short-Term Financing - Commercial Paper and Reverse Repurchase Agreements (Details) - USD ($) $ in Billions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Commercial Paper
Short-term Debt [Line Items]
Short-term debt, average outstanding amount	$ 4.2	$ 4.1
Weighted average interest rates	4.00%	4.80%
Weighted average maturity (approximately in days)	3 days	2 days
Reverse Repurchase Agreements
Short-term Debt [Line Items]
Short-term debt, average outstanding amount	$ 3.6	$ 2.9
Weighted average interest rates	4.10%	4.80%