Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	GIA Common Units	Retained Earnings	Treasury Stock, Common	Accumulated Other Comprehensive Income/(Loss)	Noncontrolling Interest	GIA [Member]
Common shares in treasury				83,000
Balance at beginning of period (in shares) at Jun. 30, 2024		327,000
Balance at beginning of period at Jun. 30, 2024	$ (3,212)	$ 2,917	$ (286)		$ (167)	$ 1
Treasury, balance at beginning of period (in shares) at Jun. 30, 2024				(83,000)
Treasury, balance at beginning of period at Jun. 30, 2024	(5,677)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,326					4
Net Income (Loss) Attributable to Parent	1,322
Other Comprehensive Income (Loss), Net of Tax	(9)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(9)				(9)
Noncontrolling Interest, Increase from Business Combination	(1,035)					(1,035)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		0		1,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(80)	$ (28)		$ (52)
Purchase of treasury shares, net	$ (765)			$ (750)
Treasury shares acquired (in shares)				(6,000)
Retirement of treasury stock	0	(56,000)		(56,000)
Dividends	$ (370)		(370)
Stockholders' Equity, Other Shares		(1,000)
Other	(16)		(2)			(17)
Balance at end of period (in shares) at Mar. 31, 2025		271,000
Balance at end of period at Mar. 31, 2025	(1,898)	$ 2,946	664		(176)	1,050
Treasury, balance at end of period (in shares) at Mar. 31, 2025				(32,000)
Treasury, balance at end of period at Mar. 31, 2025	(6,382)
Treasury Stock, Value, Acquired, Cost Method	(757)			$ (757)
Payments to Noncontrolling Interests	7						$ (7)
Balance at beginning of period (in shares) at Jun. 30, 2024		327,000
Balance at beginning of period at Jun. 30, 2024	(3,212)	$ 2,917	(286)		(167)	1
Treasury, balance at beginning of period (in shares) at Jun. 30, 2024				(83,000)
Treasury, balance at beginning of period at Jun. 30, 2024	(5,677)
Payments to Noncontrolling Interests	12
Balance at end of period (in shares) at Jun. 30, 2025		271,000
Balance at end of period at Jun. 30, 2025	$ (2,634)	$ 2,956	783		(155)	147
Treasury, balance at end of period (in shares) at Jun. 30, 2025	(32,000)			32,000
Treasury, balance at end of period at Jun. 30, 2025	$ (6,365)
Common shares in treasury				29,000
Balance at beginning of period (in shares) at Dec. 31, 2024		271,000
Balance at beginning of period at Dec. 31, 2024	(2,921)	$ 2,932	283		(180)	70
Treasury, balance at beginning of period (in shares) at Dec. 31, 2024				(29,000)
Treasury, balance at beginning of period at Dec. 31, 2024	(6,026)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	508					2
Net Income (Loss) Attributable to Parent	506
Other Comprehensive Income (Loss), Net of Tax	4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	4				4
Noncontrolling Interest, Increase from Business Combination	(963)					(963)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		0		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(35)	$ (13)		$ (22)
Purchase of treasury shares, net		0
Treasury shares acquired (in shares)				(3,000)
Dividends	(123)		(123)
Other	(17)	$ 1	(2)			(18)
Balance at end of period (in shares) at Mar. 31, 2025		271,000
Balance at end of period at Mar. 31, 2025	(1,898)	$ 2,946	664		(176)	1,050
Treasury, balance at end of period (in shares) at Mar. 31, 2025				(32,000)
Treasury, balance at end of period at Mar. 31, 2025	(6,382)
Treasury Stock, Value, Acquired, Cost Method	$ (378)			$ (378)
Payments to Noncontrolling Interests							$ (3)
Common shares in treasury				32,000
Common shares in treasury	32,000			(32,000)
Balance at beginning of period (in shares) at Jun. 30, 2025		271,000
Balance at beginning of period at Jun. 30, 2025	$ (2,634)	$ 2,956	783		(155)	147
Treasury, balance at beginning of period (in shares) at Jun. 30, 2025	(32,000)			32,000
Treasury, balance at beginning of period at Jun. 30, 2025	$ (6,365)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,305					(11)
Net Income (Loss) Attributable to Parent	1,316
Other Comprehensive Income (Loss), Net of Tax	(6)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(6)				(6)
Noncontrolling Interest, Increase from Business Combination	$ (31)					(31)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	1,000	0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 14	$ (91)		$ (105)
Purchase of treasury shares, net	(1,008)	$ 50		$ (1,000)
Treasury shares acquired (in shares)				(5,000)
Dividends	(366)		(366)
Payments to Noncontrolling Interests	8					8
Stockholders' Equity, Other Shares		0
Other	$ 0		1			(1)
Balance at end of period (in shares) at Mar. 31, 2026	271,000	271,000
Balance at end of period at Mar. 31, 2026	$ (2,672)	$ 2,815	1,732		(161)	160
Treasury, balance at end of period (in shares) at Mar. 31, 2026	(36,000)			(36,000)
Treasury, balance at end of period at Mar. 31, 2026	$ (7,218)
Treasury Stock, Value, Acquired, Cost Method	(1,008)			$ (958)
Payments to Noncontrolling Interests	8
Common shares in treasury				(35,000)
Balance at beginning of period (in shares) at Dec. 31, 2025		271,000
Balance at beginning of period at Dec. 31, 2025	(2,700)	$ 2,847	1,455		(153)	184
Treasury, balance at beginning of period (in shares) at Dec. 31, 2025				35,000
Treasury, balance at beginning of period at Dec. 31, 2025	(7,033)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	380					(19)
Net Income (Loss) Attributable to Parent	399
Other Comprehensive Income (Loss), Net of Tax	(8)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(8)
Noncontrolling Interest, Increase from Business Combination	(1)					(1)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		0		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(34)	$ (18)		$ (16)
Purchase of treasury shares, net		50
Treasury shares acquired (in shares)				(1,000)
Retirement of treasury stock				(56,000)
Dividends	(121)		(121)
Payments to Noncontrolling Interests	4					4
Other	$ 1	$ 0	(1)
Balance at end of period (in shares) at Mar. 31, 2026	271,000	271,000
Balance at end of period at Mar. 31, 2026	$ (2,672)	$ 2,815	$ 1,732		$ (161)	$ 160
Treasury, balance at end of period (in shares) at Mar. 31, 2026	(36,000)			(36,000)
Treasury, balance at end of period at Mar. 31, 2026	$ (7,218)
Treasury Stock, Value, Acquired, Cost Method	$ (251)			$ (201)
Common shares in treasury	36,000			36,000