Short-term Borrowings and Long-term Debt - Schedule of Debt Maturities (Details) - USD ($) $ in Millions	Jan. 31, 2024	Jan. 31, 2023
Debt Instrument [Line Items]
2025	$ 3,447	$ 4,191
Total debt	39,579	$ 38,840
Unsecured debt
Debt Instrument [Line Items]
2025	3,447
2026	2,600
2027	3,483
2028	1,760
2029	3,458
Thereafter	24,831
Total debt	$ 39,579