Leases (Lessee Liability Maturity) (Details) $ in Millions	Jan. 31, 2022 USD ($)
Operating Leases
2023	$ 2,164
2024	2,040
2025	1,876
2026	1,713
2027	1,551
Thereafter	11,322
Total undiscounted lease obligations	20,666
Less imputed interest	(6,174)
Operating lease, liability	14,492
Finance Leases
2023	736
2024	675
2025	611
2026	555
2027	482
Thereafter	4,987
Total undiscounted lease obligations	8,046
Less imputed interest	(3,292)
Finance lease, liability	$ 4,754