Restructuring Charges - Additional Information (Detail) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	May 31, 2016 Position	Mar. 31, 2017 USD ($) Position	Jun. 30, 2016 USD ($) Position	Jun. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0
Phone Hardware Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | Position			7,400
Restructuring charges				$ 780
Reversal of prior year restructuring charges			$ (21)
Completion date		Jun. 30, 2017
2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 501
Completion date		Jun. 30, 2017
Number of positions expected to be eliminated | Position	1,850	2,850