Short-term Financing (Details) - USD ($)		3 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Short-term Debt [Line Items]
Line of credit facility, fair value of amount outstanding		$ 0
Commercial paper		$ 0
Maturities of short-term funding agreements		overnight to up to five business days
Obligations under reverse repurchase agreements	[1]	$ 0		$ 13,600,000
364-day credit agreement
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities		$ 3,200,000,000
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		$ 3,750,000,000
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
Maturities of commercial paper range		overnight to up to 364 days
Short-term debt, average outstanding amount		$ 2,400,000,000	$ 4,000,000,000.0
Debt instrument, interest rate during period		0.10%	2.30%
Short Term Commercial Paper Program
Short-term Debt [Line Items]
Commercial paper weighted average maturity		1 day	2 days
Reverse repurchase agreements
Short-term Debt [Line Items]
Short-term debt, average outstanding amount		$ 152,400,000	$ 426,600,000
Debt instrument, interest rate during period		0.30%	2.00%

[1] (A) 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 9).