Leases - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017
Leases [Line Items]
Assets recorded under finance leases	$ 3,400	$ 2,700
Accumulated depreciation associated with finance leases	209	$ 161
Operating Lease
Leases [Line Items]
Additional leases, primarily for datacenters, that have not yet commenced	219
Finance Lease
Leases [Line Items]
Additional leases, primarily for datacenters, that have not yet commenced	$ 2,300
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	20 years
Additional finance leases that have not yet commenced, lease terms	20 years