Revenue Classified By Significant Product And Service Offerings (Detail) (USD $) In Millions	3 Months Ended										12 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009		Sep. 30, 2009		Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Revenue from External Customer [Line Items]
Revenue	$ 17,367	$ 16,428	$ 19,953	$ 16,195	$ 16,039	$ 14,503	$ 19,022	[1]	$ 12,920	[2]	$ 69,943	$ 62,484	$ 58,437
Microsoft Office system
Revenue from External Customer [Line Items]
Revenue											20,730	17,754	17,998
Windows PC operating systems
Revenue from External Customer [Line Items]
Revenue											17,825	18,225	14,653
Server products and tools
Revenue from External Customer [Line Items]
Revenue											13,251	12,007	11,344
Xbox 360 platform
Revenue from External Customer [Line Items]
Revenue											8,103	5,456	5,475
Consulting and product support services
Revenue from External Customer [Line Items]
Revenue											3,372	3,036	3,024
Advertising
Revenue from External Customer [Line Items]
Revenue											2,913	2,528	2,345
Other products and services
Revenue from External Customer [Line Items]
Revenue											$ 3,749	$ 3,478	$ 3,598

[1] Reflects $1.7 billion of revenue recognized for sales of Windows Vista with a guarantee to be upgraded to Windows 7 at minimal or no cost and of Windows 7 to original equipment manufacturers and retailers before general availability (the "Windows 7 Deferral").

[2] Reflects $1.5 billion of revenue deferred to future periods relating to the Windows 7 Deferral.