Pension and Other Postretirement Benefits - Schedule of Amounts Recognized in Balance Sheets (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	$ 461
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Pension assets	6	$ 4
Accrued pension liabilities	(408)	(500)
Net amount recognized	(402)	(496)
Postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Accrued pension liabilities	(53)	(98)
Net amount recognized	$ (53)	$ (98)