Short-Term Financing - Narrative (Details) - USD ($)		12 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Short-term Debt [Line Items]
Line of credit facility, fair value of amount outstanding		$ 0	$ 0
Commercial paper		$ 0	0
Maturities of short-term funding agreements (up to)		5 days
Obligations under reverse repurchase agreements	[1]	$ 23,500,000	$ 13,600,000
364-Day Credit Agreement
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 3,750,000,000
Term of credit		364 days
Debt instrument, extension option term		1 year
Credit Facility Expiring In June Two Thousand Twenty Four
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 2,750,000,000
Term of credit		5 years
Line of credit facility potentially available increase in maximum borrowing capacity		$ 500,000,000
Credit Facility Expiring In June Two Thousand Twenty Six
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 3,200,000,000
Term of credit		5 years
Line of credit facility potentially available increase in maximum borrowing capacity		$ 500,000,000
Commercial Paper
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 9,700,000,000
Debt instrument, maturity period		364 days

[1] (A) As of June 30, 2021, $23.5 million of long-term marketable securities have been pledged as collateral under the Company's reverse repurchase agreements. As of June 30, 2020, $13.6 million of long-term marketable securities have been pledged as collateral under the Company's reverse repurchase agreements (see Note 8).