Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible asset amortization expense	$ 436	$ 414
Estimated amortization expense, year ending June 30, 2026	585
Estimated amortization expense, year ending June 30, 2027	587
Estimated amortization expense, year ending June 30, 2028	579
Estimated amortization expense, year ending June 30, 2029	558
Estimated amortization expense, year ending June 30, 2030	$ 529