Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jan. 31, 2024	Jan. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment	$ 219,859	$ 202,370
Accumulated depreciation	(109,049)	(101,610)
Property and equipment, net	110,810	100,760
Land
Property, Plant and Equipment [Line Items]
Property and equipment	19,562	19,317
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 111,767	104,554
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 72,161	65,235
Fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	30 years
Transportation equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,979	2,462
Transportation equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Transportation equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment	$ 13,390	$ 10,802