Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2023	Apr. 30, 2023	Jul. 31, 2022	Apr. 30, 2022
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	$ 79,231	$ 83,754	$ 85,600	$ 91,891
Other comprehensive income (loss) before reclassifications, net	309	520	(1,416)	251
Reclassifications to income, net	20	13	20	17
Ending balance	85,327	79,231	85,587	85,600
AOCI Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(11,147)	(11,680)	(8,498)	(8,766)
Ending balance	(10,818)	(11,147)	(9,894)	(8,498)
Currency Translation and Other
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(10,216)	(10,816)	(7,875)	(8,100)
Other comprehensive income (loss) before reclassifications, net	195	600	(796)	225
Reclassifications to income, net	0	0	(309)	0
Ending balance	(10,021)	(10,216)	(8,980)	(7,875)
Net Investment Hedges
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	94	94	94	94
Other comprehensive income (loss) before reclassifications, net	0	0	0	0
Reclassifications to income, net	0	0	0	0
Ending balance	94	94	94	94
Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(1,020)	(951)	(706)	(748)
Other comprehensive income (loss) before reclassifications, net	115	(82)	(622)	26
Reclassifications to income, net	20	13	329	16
Ending balance	(885)	(1,020)	(999)	(706)
Minimum Pension Liability
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(5)	(7)	(11)	(12)
Other comprehensive income (loss) before reclassifications, net	(1)	2	2	0
Reclassifications to income, net	0	0	0	1
Ending balance	$ (6)	$ (5)	$ (9)	$ (11)