Maturities of Lease Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Jun. 30, 2020
Leases [Abstract]
Operating Leases, Year Ending June 30, 2021 (excluding the nine months ended March 31, 2021)	$ 603
Operating Leases, Year Ending June 30, 2022	1,981
Operating Leases, Year Ending June 30, 2023	1,803
Operating Leases, Year Ending June 30, 2024	1,607
Operating Leases, Year Ending June 30, 2025	1,320
Operating Leases, Thereafter	4,716
Operating Leases, Total lease payments	12,030
Operating Leases, Less imputed interest	(882)
Operating Leases	11,148	$ 9,287
Finance Leases, Year Ending June 30, 2021 (excluding the nine months ended March 31, 2021)	278
Finance Leases, Year Ending June 30, 2022	1,128
Finance Leases, Year Ending June 30, 2023	1,140
Finance Leases, Year Ending June 30, 2024	1,156
Finance Leases, Year Ending June 30, 2025	1,481
Finance Leases, Thereafter	9,510
Finance Leases, Total lease payments	14,693
Finance Leases, Less imputed interest	(2,639)
Finance Leases	$ 12,054	$ 9,496