Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 278	$ 298
Estimated amortization expense, year ending June 30, 2024	550
Estimated amortization expense, year ending June 30, 2025	547
Estimated amortization expense, year ending June 30, 2026	539
Estimated amortization expense, year ending June 30, 2027	532
Estimated amortization expense, year ending June 30, 2028	$ 506