Earnings per share - Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Numerator:
Net income	$ 808	$ 698
Denominator:
Basic - weighted average common shares (in shares)	126.5	128.7
Dilutive effect of equity-based awards (in shares)	1.9	2.0
Diluted - weighted-average common shares (in shares)	128.4	130.7
Basic earnings per share (in USD per share)	$ 6.39	$ 5.43
Diluted earnings per share (in USD per share)	$ 6.29	$ 5.34