Maturities of lease liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Leases [Abstract]
Operating Leases, Year Ending June 30, 2019	$ 1,492
Operating Leases, Year Ending June 30, 2020	1,347
Operating Leases, Year Ending June 30, 2021	1,086
Operating Leases, Year Ending June 30, 2022	902
Operating Leases, Year Ending June 30, 2023	721
Operating Leases, Thereafter	2,157
Operating Leases, Total lease payments	7,705
Operating Leases, Less imputed interest	(738)
Operating Leases	6,967	$ 6,795
Finance Leases, Year Ending June 30, 2019	386
Finance Leases, Year Ending June 30, 2020	393
Finance Leases, Year Ending June 30, 2021	401
Finance Leases, Year Ending June 30, 2022	408
Finance Leases, Year Ending June 30, 2023	410
Finance Leases, Thereafter	4,036
Finance Leases, Total lease payments	6,034
Finance Leases, Less imputed interest	(1,733)
Finance Leases	$ 4,301	$ 2,538