Consolidated Statements of Shareholders' Equity/(Deficit) - USD ($) shares in Thousands, $ in Millions	Total	GIA Common Stock [Member]	Retained Earnings/(Accumulated Deficit)	Treasury Shares	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance at beginning of period (in shares) at Jun. 30, 2022		327,000
Balance at beginning of period at Jun. 30, 2022	$ (882)	$ 2,813	$ (456)		$ (114)	$ 3
Common shares in treasury at Jun. 30, 2022				54,000
Treasury, balance at beginning of period at Jun. 30, 2022	(3,128)
Increase (Decrease) in Shareholders' Equity
Net earnings	331					1
Net earnings	331
Other comprehensive loss, net of tax	(37)				(37)
Purchase of noncontrolling interests	3					3
Employee stock plans activity, net of shares withheld for employee taxes (in shares)		0		3,000
Employee stock plans activity, net of shares withheld for employee taxes	157	$ 33		$ 124
Share repurchase program activity	2,000
Share repurchase program activity		$ (100)
Treasury shares acquired (in shares)				(24,600)
Share repurchase program activity	(2,007)			$ (1,907)
Dividends declared	(515)		(515)
Other	(1)		(1)
Balance at end of period (in shares) at Jun. 30, 2023		327,000
Common shares in treasury at Jun. 30, 2023				76,000
Balance at end of period at Jun. 30, 2023	(2,957)	$ 2,746	(642)		(151)	1
Treasury, balance at end of period at Jun. 30, 2023	(4,911)
Increase (Decrease) in Shareholders' Equity
Net Income (Loss)	330
Net earnings	853					1
Other comprehensive loss, net of tax	(16)				(16)
Employee stock plans activity, net of shares withheld for employee taxes (in shares)		0		2,000
Employee stock plans activity, net of shares withheld for employee taxes	164	$ 71		$ 93
Share repurchase program activity	750
Share repurchase program activity		$ 100
Treasury shares acquired (in shares)				(9,000)
Share repurchase program activity	(759)			$ (859)
Dividends declared	(496)		(496)
Other	$ (1)					(1)
Balance at end of period (in shares) at Jun. 30, 2024	327,000	327,000
Common shares in treasury at Jun. 30, 2024	83,000			83,000
Balance at end of period at Jun. 30, 2024	$ (3,212)	$ 2,917	(286)		(167)	1
Treasury, balance at end of period at Jun. 30, 2024	(5,677)
Increase (Decrease) in Shareholders' Equity
Net Income (Loss)	852
Net earnings	1,569					8
Other comprehensive loss, net of tax	12				12
Employee stock plans activity, net of shares withheld for employee taxes (in shares)		0		1,000
Employee stock plans activity, net of shares withheld for employee taxes	108	$ 38		$ 70
Share repurchase program activity	765
Treasury shares acquired (in shares)				(6,400)
Share repurchase program activity	(757)			$ (757)
Dividends declared	(492)		(492)
Other	$ (1)			$ (1)		(1)
Balance at end of period (in shares) at Jun. 30, 2025	271,000	271,000
Common shares in treasury at Jun. 30, 2025	32,000			32,000
Balance at end of period at Jun. 30, 2025	$ (2,634)	$ 2,956	$ 783		$ (155)	147
Treasury, balance at end of period at Jun. 30, 2025	(6,365)
Increase (Decrease) in Shareholders' Equity
Net Income (Loss)	$ 1,561
Treasury Stock, Shares, Retired	0	(56,000)		(56,000)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	$ (12)					(12)
Noncontrolling Interest, Increase from Business Combination	$ 151					$ 151