Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	$ 83,754	$ 91,891
Other comprehensive income (loss) before reclassifications, net	520	251
Reclassifications to income, net	13	17
Ending balance	79,231	85,600
AOCI Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(11,680)	(8,766)
Ending balance	(11,147)	(8,498)
Currency Translation and Other
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(10,816)	(8,100)
Other comprehensive income (loss) before reclassifications, net	600	225
Reclassifications to income, net	0	0
Ending balance	(10,216)	(7,875)
Net Investment Hedges
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	94	94
Other comprehensive income (loss) before reclassifications, net	0	0
Reclassifications to income, net	0	0
Ending balance	94	94
Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(951)	(748)
Other comprehensive income (loss) before reclassifications, net	(82)	26
Reclassifications to income, net	13	16
Ending balance	(1,020)	(706)
Minimum Pension Liability
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(7)	(12)
Other comprehensive income (loss) before reclassifications, net	2	0
Reclassifications to income, net	0	1
Ending balance	$ (5)	$ (11)