Short-term Financing - Narrative (Details) - USD ($)		3 Months Ended
		Sep. 30, 2021	Jun. 30, 2021
Short-term Debt [Line Items]
Line of credit facility, fair value of amount outstanding		$ 0
Commercial paper		0	$ 0
Obligations under reverse repurchase agreements	[1]	45,800,000	$ 23,500,000
364-day credit agreement
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 3,750,000,000
Term of credit agreement		364 days
Extension option term		1 year
Credit Facility Expiring In June 2024
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 2,750,000,000
Term of credit agreement		5 years
Line of credit facility potentially available increase in maximum borrowing capacity		$ 500,000,000
Credit Facility Expiring In June 2023
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 3,200,000,000
Term of credit agreement		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		$ 9,700,000,000
Debt instrument, term		364 days
Reverse repurchase agreements | Maximum
Short-term Debt [Line Items]
Debt instrument, term		5 days

[1] As of September 30, 2021, $45.8 million of short-term marketable securities have been pledged as collateral under the Company's reverse repurchase agreements. 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 (see Note 9).