Pension and Other Postretirement Benefits - Schedule of Assumptions Used (Details)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Pension benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	4.80%	2.70%	2.80%
Weighted-average assumptions used to determine net periodic benefit costs
Expected return on plan assets	5.10%	6.50%	7.00%
Pension benefits | Service Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	2.80%	2.90%	3.70%
Pension benefits | Interest Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	2.10%	2.20%	3.20%
Postretirement benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	4.80%	2.70%	2.80%
Postretirement benefits | Service Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	2.90%	3.00%	3.80%
Postretirement benefits | Interest Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	2.20%	2.20%	3.20%