Retirement Benefit Obligations - Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	$ 539	$ 527
Prior service cost (benefit)	(27)	(14)
Net amounts recognized	512	513
Domestic Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	130	153
Prior service cost (benefit)	0	0
Net amounts recognized	130	153
Foreign Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	403	368
Prior service cost (benefit)	9	8
Net amounts recognized	412	376
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	6	6
Prior service cost (benefit)	(36)	(22)
Net amounts recognized	$ (30)	$ (16)