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		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Numerator:
Net income attributable to common shareholders, basic	$ 904	$ 961	$ 2,557	$ 2,608
Net income attributable to common shareholders, diluted	$ 904	$ 961	$ 2,557	$ 2,608
Denominator:
Basic - weighted average common shares (in shares)	126.2	128.4	126.3	128.6
Dilutive effect of equity-based awards (in shares)	1.8	1.9	1.8	2.0
Diluted - weighted-average common shares (in shares)	128.0	130.3	128.2	130.6
Basic earnings per share (in USD per share)	$ 7.16	$ 7.48	$ 20.24	$ 20.28
Diluted earnings per share (in USD per share)	$ 7.06	$ 7.37	$ 19.95	$ 19.97