Future Minimum Lease Payments under Non-cancellable Leases (Detail) $ in Millions	Sep. 30, 2017 USD ($)
Leases [Line Items]
Operating Leases, Year Ending June 30, 2018 (excluding the three months ended September 30, 2017)	$ 1,110
Operating Leases, Year Ending June 30, 2019	1,385
Operating Leases, Year Ending June 30, 2020	1,267
Operating Leases, Year Ending June 30, 2021	1,022
Operating Leases, Year Ending June 30, 2022	833
Operating Leases, Thereafter	2,333
Operating Leases, Total future minimum lease payments	7,950
Operating Leases, Less imputed interest	(930)
Operating Leases	7,020
Finance Leases, Year Ending June 30, 2018 (excluding the three months ended September 30, 2017)	205
Finance Leases, Year Ending June 30, 2019	281
Finance Leases, Year Ending June 30, 2020	287
Finance Leases, Year Ending June 30, 2021	293
Finance Leases, Year Ending June 30, 2022	299
Finance Leases, Thereafter	3,133
Finance Leases, Total future minimum lease payments	4,498
Finance Leases, Less imputed interest	(1,225)
Finance Leases	3,273
Other Current Liabilities
Leases [Line Items]
Operating Leases	1,252
Finance Leases	146
Operating Lease Liabilities
Leases [Line Items]
Operating Leases	5,768
Finance Leases	0
Other Long-term Liabilities
Leases [Line Items]
Operating Leases	0
Finance Leases	$ 3,127