Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net earnings	$ 3,752.0	$ 3,412.0	$ 2,948.9
Other comprehensive (loss)/income:
Currency translation adjustments	(38.0)	13.4	(127.4)
Unrealized net gains/(losses) on available-for-sale securities	685.2	(500.3)	(2,228.0)
Tax effect	(162.2)	113.3	503.7
Reclassification of net losses on available-for-sale securities to net earnings	5.9	14.7	4.4
Tax effect	(1.3)	(3.3)	(1.0)
Amortization of unrealized losses on cash flow hedging activities	4.4	4.4	4.4
Tax effect	(1.1)	(1.1)	(1.1)
Pension net gains/(losses) arising during the year	5.6	60.3	(229.8)
Tax effect	(1.1)	(13.3)	57.3
Reclassification of pension liability adjustment to net earnings	0.1	(0.4)	18.1
Tax effect	0.0	0.2	(4.9)
Other comprehensive income/(loss), net of tax	497.5	(312.1)	(2,004.3)
Comprehensive income	$ 4,249.5	$ 3,099.9	$ 944.6