Leases - Additional Information (Detail) $ in Billions	3 Months Ended
	Sep. 30, 2018 USD ($)
Operating Lease
Leases [Line Items]
Additional leases, primarily for datacenters, that have not yet commenced	$ 2.6
Finance Lease
Leases [Line Items]
Additional leases, primarily for datacenters, that have not yet commenced	$ 4.8
Lower Limit
Leases [Line Items]
Operating and Finance leases, remaining lease terms	1 year
Additional operating leases that have not yet commenced, lease terms	1 year
Additional finance leases that have not yet commenced, lease terms	1 year
Upper Limit
Leases [Line Items]
Operating and Finance leases, remaining lease terms	20 years
Operating leases, options to extend leases term	5 years
Finance leases, options to extend leases term	5 years
Operating and Finance leases, options to terminate leases term	1 year
Additional operating leases that have not yet commenced, lease terms	15 years
Additional finance leases that have not yet commenced, lease terms	15 years