Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	$ 90,349	$ 83,754
Other comprehensive income (loss) before reclassifications, net	(83)	520
Reclassifications to income, net	18	13
Ending balance	88,073	79,231
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(11,302)	(11,680)
Ending balance	(11,367)	(11,147)
Currency  Translation and Other
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(10,407)	(10,729)
Other comprehensive income (loss) before reclassifications, net	(93)	602
Reclassifications to income, net	0	0
Ending balance	(10,500)	(10,127)
Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(895)	(951)
Other comprehensive income (loss) before reclassifications, net	10	(82)
Reclassifications to income, net	18	13
Ending balance	$ (867)	$ (1,020)