Short-term Borrowings and Long-term Debt - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Debt Instrument [Line Items]
Short-term borrowings	$ 878	$ 372
Average interest rate	7.70%	6.60%
Letters of credit, drawn	$ 1,700	$ 1,800
Loss on extinguishment of debt	0	0	$ 2,410
Premiums paid to extinguish debt	$ 0	0	$ 2,317
Fronted and Syndicated Lines of Credit | Minimum
Debt Instrument [Line Items]
Commitment fee	0.00015
Fronted and Syndicated Lines of Credit | Maximum
Debt Instrument [Line Items]
Commitment fee	0.00040
Fronted and Syndicated Lines of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum
Debt Instrument [Line Items]
Variable rate commitment	0.0055
Letter of Credit
Debt Instrument [Line Items]
Principal Amount	$ 2,100	$ 2,100