Taxes (Schedule of Deferred Tax Balances) (Details) - USD ($) $ in Millions	Jan. 31, 2023	Jan. 31, 2022
Deferred tax assets:
Loss and tax credit carryforwards	$ 7,690	$ 9,456
Accrued liabilities	3,312	2,752
Share-based compensation	237	231
Lease obligations	4,653	4,320
Other	839	893
Total deferred tax assets	16,731	17,652
Valuation allowances	(7,815)	(9,542)
Deferred tax assets, net of valuation allowances	8,916	8,110
Deferred tax liabilities:
Property and equipment	4,352	4,414
Acquired intangibles	932	1,065
Inventory	3,032	1,588
Lease right of use assets	4,727	4,355
Mark-to-market investments	1,390	1,825
Other	249	307
Total deferred tax liabilities	14,682	13,554
Net deferred tax liabilities	$ 5,766	$ 5,444