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Short-term Borrowings and Long-term Debt - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Debt Instrument [Line Items]
Short-term borrowings	$ 6,596	$ 3,068
Average interest rate	4.00%	5.30%
Letters of credit, drawn	$ 1,700	$ 1,500
Proceeds from issuance of long-term debt	3,983	0	$ 4,967
Senior Unsecured Notes
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 3,983
Fronted and Syndicated Lines of Credit \| Minimum
Debt Instrument [Line Items]
Variable rate commitment	0.0045
Commitment fee	0.00015
Fronted and Syndicated Lines of Credit \| Maximum
Debt Instrument [Line Items]
Commitment fee	0.00040
Letter of Credit
Debt Instrument [Line Items]
Principal Amount	$ 2,000	$ 2,100