Segment Revenue and Operating Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Revenue	$ 16,008	$ 17,372
Operating income (loss)	5,308	7,203
Windows & Windows Live Division
Segment Reporting Information [Line Items]
Revenue	4,401	4,838
Operating income (loss)	2,805	3,235
Server and Tools
Segment Reporting Information [Line Items]
Revenue	4,555	4,217
Operating income (loss)	1,754	1,573
Online Services Division
Segment Reporting Information [Line Items]
Revenue	713	658
Operating income (loss)	(359)	(513)
Microsoft Business Division
Segment Reporting Information [Line Items]
Revenue	5,683	5,618
Operating income (loss)	3,828	3,701
Entertainment and Devices Division
Segment Reporting Information [Line Items]
Revenue	1,938	1,968
Operating income (loss)	13	351
Unallocated and other
Segment Reporting Information [Line Items]
Revenue	(1,282)	73
Reconciling amounts
Segment Reporting Information [Line Items]
Operating income (loss)	$ (2,733)	$ (1,144)