Short-term Borrowings and Long-term Debt - Significant Long-term Debt Issued (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022	Apr. 18, 2023	Sep. 09, 2022
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 4,967	$ 5,041	$ 6,945
Senior Unsecured Notes
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	4,967	4,969
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
3.900% Debt, Due 2025 | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal Amount					$ 1,750
Interest Rate					3.90%
Proceeds from issuance of long-term debt		1,744
3.950% Debt, Due 2027 | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal Amount					$ 1,000
Interest Rate					3.95%
Proceeds from issuance of long-term debt		994
4.150% Debt, Due 2032 | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal Amount					$ 1,250
Interest Rate					4.15%
Proceeds from issuance of long-term debt		1,239
4.500% Debt, Due 2052 | Senior Unsecured Notes
Debt Instrument [Line Items]
Principal Amount					$ 1,000
Interest Rate					4.50%
Proceeds from issuance of long-term debt		$ 992