Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 298	$ 229
Estimated amortization expense, year ending June 30, 2024	580
Estimated amortization expense, year ending June 30, 2025	543
Estimated amortization expense, year ending June 30, 2026	538
Estimated amortization expense, year ending June 30, 2027	533
Estimated amortization expense, year ending June 30, 2028	$ 524