Pension and Other Postretirement Benefits - Defined Benefit - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution plans, employer contribution	$ 68	$ 58	$ 49
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	1,040	1,070
Fair value of plan asset	853	801	972
Net amounts recognized	$ 1,172	$ 1,203	$ 1,468
Pension benefits | Return Seeking Assets
Defined Benefit Plan Disclosure [Line Items]
Target Asset Allocation	50.00%
Pension benefits | Liability Hedging Assets
Defined Benefit Plan Disclosure [Line Items]
Target Asset Allocation	50.00%
Pension benefits | Overfunded Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 112
Fair value of plan asset	123
Net amounts recognized	$ 115