Goodwill - Rollforward (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Goodwill [Roll Forward]
Beginning balance			$ 3,039,000,000
Foreign currency translation adjustments			(13,000,000)
Ending balance	$ 2,339,000,000		$ 2,339,000,000
Goodwill Input, Discount Rate Minimum, Percentage	10.00%	1050.00%	10.00%	1050.00%
Net revenue	$ 1,074,000,000	$ 1,037,000,000	$ 3,080,000,000	$ 3,208,000,000
Goodwill Inputs Long Term Revenue Growth Rate, Percentage	3.50%	300.00%	3.50%	300.00%
Goodwill Input, Discount Rate Minimum, Percentage	10.00%	1050.00%	10.00%	1050.00%
Goodwill Input Discount Rate Minimum, Percentage	9.00%	900.00%	9.00%	900.00%
Goodwill, Impairment Loss	$ 0	$ (210,000,000)	$ (687,000,000)	$ (210,000,000)
Goodwill, Impaired, Accumulated Impairment Loss	897,000,000		897,000,000
Biologics
Goodwill [Roll Forward]
Beginning balance			1,563,000,000
Foreign currency translation adjustments			(4,000,000)
Ending balance	1,167,000,000		1,167,000,000
Goodwill, Impairment Loss			(392,000,000)
Biologics | Manufacturing & Commercial Product Supply
Goodwill [Roll Forward]
Net revenue	261,000,000	133,000,000	821,000,000	304,000,000
Biologics | Development Services
Goodwill [Roll Forward]
Net revenue	200,000,000	342,000,000	526,000,000	1,274,000,000
PharmaConsumerHealth
Goodwill [Roll Forward]
Beginning balance			1,476,000,000
Foreign currency translation adjustments			(9,000,000)
Ending balance	1,172,000,000		1,172,000,000
Goodwill, Impairment Loss	(295,000,000)	(210,000,000)	(687,000,000)	(210,000,000)
PharmaConsumerHealth | Manufacturing & Commercial Product Supply
Goodwill [Roll Forward]
Net revenue	402,000,000	349,000,000	1,109,000,000	1,027,000,000
PharmaConsumerHealth | Development Services
Goodwill [Roll Forward]
Net revenue	211,000,000	214,000,000	625,000,000	605,000,000
Total Catalent before inter-segment revenue elimination | Manufacturing & Commercial Product Supply
Goodwill [Roll Forward]
Net revenue	663,000,000	482,000,000	1,930,000,000	1,331,000,000
Total Catalent before inter-segment revenue elimination | Development Services
Goodwill [Roll Forward]
Net revenue	$ 411,000,000	$ 556,000,000	$ 1,151,000,000	$ 1,879,000,000