Short-term Financing - Narrative (Details) - USD ($)		9 Months Ended
		Mar. 31, 2025	Jun. 30, 2024
Short-term Debt [Line Items]
Line of credit facility, fair value of amount outstanding		$ 0
Commercial paper		$ 0	$ 0
Maturities of short-term funding agreements (up to)		5 days
Obligations under reverse repurchase agreements	[1]	$ 0	$ 385,400,000
Aggregate committed obligations under reverse repurchase agreements		7,300,000,000
364-day credit agreement
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 4,550,000,000
Term of credit		364 days
Extension option term		1 year
Credit Facility Expiring In June 2028
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 2,250,000,000
Term of credit		5 years
Line of credit facility potentially available increase in maximum borrowing capacity		$ 500,000,000
Credit Facility Expiring In June 2029
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 3,500,000,000
Term of credit		5 years
Line of credit facility potentially available increase in maximum borrowing capacity		$ 500,000,000
Commercial paper program
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 10,300,000,000
Debt instrument, maturity period		364 days

[1] As of June 30, 2024, $384.0 million of short-term marketable securities and $1.4 million of cash and cash equivalents have been pledged as collateral under the Company's reverse repurchase agreements (see Note 10).