Maturities of Lease Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Jun. 30, 2020
Leases [Abstract]
Operating Leases, Year Ending June 30, 2021 (excluding the six months ended December 31, 2020)	$ 1,099
Operating Leases, Year Ending June 30, 2022	1,997
Operating Leases, Year Ending June 30, 2023	1,811
Operating Leases, Year Ending June 30, 2024	1,579
Operating Leases, Year Ending June 30, 2025	1,280
Operating Leases, Thereafter	4,309
Operating Leases, Total lease payments	12,075
Operating Leases, Less imputed interest	(1,334)
Operating Leases	10,741	$ 9,287
Finance Leases, Year Ending June 30, 2021 (excluding the six months ended December 31, 2020)	533
Finance Leases, Year Ending June 30, 2022	1,080
Finance Leases, Year Ending June 30, 2023	1,092
Finance Leases, Year Ending June 30, 2024	1,107
Finance Leases, Year Ending June 30, 2025	1,431
Finance Leases, Thereafter	8,943
Finance Leases, Total lease payments	14,186
Finance Leases, Less imputed interest	(2,668)
Finance Leases	$ 11,518	$ 9,496