v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Jun. 30, 2012
Jul. 18, 2012
Dec. 31, 2011
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
Trading Symbol MSFT    
Entity Registrant Name MICROSOFT CORP    
Entity Central Index Key 0000789019    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Par Value Per Share $ 0.00000625    
Entity Common Stock, Shares Outstanding   8,383,396,575  
Latest Practicable Date   Jul. 18, 2012  
Entity Public Float     $ 195,333,665,376
I.R.S. Employer Identification No. 911144442