Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Income Taxes [Line Items]
U.S. deferred tax benefit	$ (2,700)
Foreign deferred tax benefit	(617)
U.S. income (loss) before income taxes	453	$ (325)	$ 7,363
Foreign income (loss) before income taxes	22,696	20,076	11,144
Deferred income tax assets, loss carryforward	4,809	4,252
Deferred income tax assets, valuation allowance	(3,310)	(4,729)
Operating loss carryforwards	13,700
Temporary differences resulting from earnings for certain non-U.S. subsidiaries which are permanently reinvested outside the United States	142,000
Unrecognized tax liability on temporary differences resulting from earnings for certain non-U.S. subsidiaries which are permanently reinvested outside the United States	45,000
Income taxes paid, net of refunds	2,400	3,900	4,400
Tax contingencies and other tax liabilities	13,500	11,800
Unrecognized tax benefits	11,737	10,164	9,599	$ 8,714
Unrecognized tax benefits, if recognized would affect our effective tax rates	10,200	8,800	7,900
Accrued interest expense related to uncertain tax positions net of federal income tax benefits	2,300	1,900	1,700
Interest expense on unrecognized tax benefits	$ 399	163	$ 237
Restatement Adjustment
Income Taxes [Line Items]
Deferred income tax assets, loss carryforward		2,500
Deferred income tax assets, valuation allowance		$ (2,500)
Regional Operating Centers
Income Taxes [Line Items]
Foreign earnings, taxed at rates lower than U.S. rate as a percentage of foreign income before tax	64.00%	69.00%	73.00%
Foreign Country
Income Taxes [Line Items]
Operating loss carryforwards	$ 11,100
Windows 10 Licenses
Income Taxes [Line Items]
U.S. income (loss) before income taxes	6,400	$ 6,000
Foreign income (loss) before income taxes	$ 317	$ 588
Phone Business | Impairment, integration, and restructuring expenses
Income Taxes [Line Items]
U.S. income (loss) before income taxes			$ (1,100)
Foreign income (loss) before income taxes			$ (8,900)