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v3.25.1

Short-term Borrowings and Long-term Debt - (Significant Long-term Debt Issued) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 30, 2025 | Apr. 30, 2024
Debt Instrument [Line Items] |  |
Proceeds from issuance of long-term debt | $ 3,983 | $ 0
Senior Unsecured Notes |  |
Debt Instrument [Line Items] |  |
Proceeds from issuance of long-term debt | 3,983 |
Floating Debt, Due 2027 | Senior Unsecured Notes |  |
Debt Instrument [Line Items] |  |
Principal Amount | 750 |
Proceeds from issuance of long-term debt | 749 |
4.100% Debt, Due 2027 | Senior Unsecured Notes |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 750 |
Interest Rate | 4.10% |
Proceeds from issuance of long-term debt | $ 748 |
4.350% Debt, Due 2030 | Senior Unsecured Notes |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 1,000 |
Interest Rate | 4.35% |
Proceeds from issuance of long-term debt | $ 993 |
4.900% Debt, Due 2035 | Senior Unsecured Notes |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 1,500 |
Interest Rate | 4.90% |
Proceeds from issuance of long-term debt | $ 1,493 |

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