Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017
Operating Leases
Operating lease right-of-use assets	$ 6,749	$ 6,555
Total operating lease liabilities	6,983	6,795
Finance Leases
Accumulated depreciation	(26,849)	(24,179)
Property and equipment, net	26,304	23,734
Total finance lease liabilities	$ 3,902	$ 2,538
Weighted Average Remaining Lease Term
Operating leases	7 years	7 years
Finance leases	14 years	13 years
Weighted Average Discount Rate
Operating leases	2.50%	2.50%
Finance leases	5.00%	4.70%
Finance Lease
Finance Leases
Property and equipment, gross	$ 4,062	$ 2,658
Accumulated depreciation	(266)	(161)
Property and equipment, net	3,796	2,497
Other Current Liabilities
Operating Leases
Total operating lease liabilities	1,343	1,423
Finance Leases
Total finance lease liabilities	156	113
Operating Lease Liabilities
Operating Leases
Total operating lease liabilities	5,640	5,372
Other Long-term Liabilities
Finance Leases
Total finance lease liabilities	$ 3,746	$ 2,425