Leases - Schedule of Other Information Relating to Lease Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Leases [Abstract]
Operating cash flows from operating leases	$ 2,273	$ 2,280	$ 2,234
Operating cash flows from finance leases	315	248	225
Financing cash flows from finance leases	1,055	563	538
Assets obtained in exchange for operating lease obligations	1,514	1,714	1,816
Assets obtained in exchange for finance lease obligations	$ 1,572	$ 1,226	$ 1,044
Weighted-average remaining lease term - operating leases	11 years 8 months 12 days	12 years
Weighted-average remaining lease term - finance leases	12 years 4 months 24 days	13 years 3 months 18 days
Weighted-average discount rate - operating leases	6.40%	6.00%
Weighted-average discount rate - finance leases	6.80%	6.50%