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Short-term Financing - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Jun. 30, 2020
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] | 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 |
Debt instrument, term |  | 364 days |
Reverse repurchase agreements | Maximum |  |  |
Short-term Debt [Line Items] |  |  |
Debt instrument, term |  | 5 days |
[1] | 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).

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