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Short-term Financing - Commercial Paper Program and Reverse Repurchase Agreements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Commercial paper program |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Average outstanding balances (in billions) | $ 4,500.0 | $ 3,900.0 | $ 4,700.0 | $ 4,000.0
Weighted average interest rates | 4.80% | 5.40% | 5.10% | 5.30%
Weighted average maturity (approximately in days) | 2 days | 2 days | 2 days | 2 days
Reverse repurchase agreements |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Average outstanding balances (in billions) | $ 3,700.0 | $ 2,400.0 | $ 3,700.0 | $ 1,900.0
Weighted average interest rates | 4.80% | 5.40% | 5.00% | 5.40%

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