Short-term Borrowings and Long-term Debt - Significant Long-term Debt Issued (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023	Apr. 18, 2023
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 0	$ 4,967	$ 5,041
Senior Unsecured Notes
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 0	4,967
4.000% Debt, Due 2026 | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal Amount				$ 750
Interest Rate				4.00%
Proceeds from issuance of long-term debt		748
3.900% Debt, Due 2028 | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal Amount				$ 750
Interest Rate				3.90%
Proceeds from issuance of long-term debt		746
4.000% Debt, Due 2030 | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal Amount				$ 500
Interest Rate				4.00%
Proceeds from issuance of long-term debt		497
4.100% Debt, Due 2033 | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal Amount				$ 1,500
Interest Rate				4.10%
Proceeds from issuance of long-term debt		1,491
4.500% Debt, Due 2053 | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal Amount				$ 1,500
Interest Rate				4.50%
Proceeds from issuance of long-term debt		$ 1,485