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Unearned Revenue - Additional Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Jun. 30, 2015
Deferred Revenue Arrangement [Line Items]    
Unearned revenue $ 24,387 $ 25,318
Windows 10 Licenses    
Deferred Revenue Arrangement [Line Items]    
Unearned revenue $ 1,300