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Restructuring - Schedule of Restructuring and Related Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2024
Restructuring Cost and Reserve [Line Items]
Cost of equipment rentals, excluding depreciation	$ 4,394	$ 4,069	$ 3,874
Depreciation of rental equipment	1,851	1,815	1,653
Selling, general and administrative expense	1,651	1,385	1,572
Non-rental depreciation and amortization	458	436	394
Other (income) expense, net	7	(4)	11
Total restructuring cost	44
Sales of rental equipment
Restructuring Cost and Reserve [Line Items]
Cost of rental equipment sales	386	386	636
Sales of new equipment, merchandise and consumables
Restructuring Cost and Reserve [Line Items]
Cost of rental equipment sales	233	$ 201	$ 219
Employee related cost
Restructuring Cost and Reserve [Line Items]
Cost of equipment rentals, excluding depreciation	8
Fixed asset related cost
Restructuring Cost and Reserve [Line Items]
Cost of equipment rentals, excluding depreciation	4
Depreciation of rental equipment	14
Fixed asset related cost \| Sales of rental equipment
Restructuring Cost and Reserve [Line Items]
Cost of rental equipment sales	4
Fixed asset related cost \| Sales of new equipment, merchandise and consumables
Restructuring Cost and Reserve [Line Items]
Cost of rental equipment sales	1
Other Restructuring Cost
Restructuring Cost and Reserve [Line Items]
Selling, general and administrative expense	1
Facility Closing
Restructuring Cost and Reserve [Line Items]
Non-rental depreciation and amortization	5
Other (income) expense, net	$ 7