Significant Reconciling Items (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2013		Mar. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	$ 7,612		$ 6,374		$ 20,691		$ 21,571
Reconciling amounts
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	1,641	[1]	8	[1]	(286)	[1]	60	[1]
Windows Upgrade Offer | Reconciling amounts
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	1,100				540
Video Games Sales | Reconciling amounts
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	380
New Office Pre-Sales | Reconciling amounts
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	101
Office Upgrade Offer | Reconciling amounts
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	$ 92				$ (784)

[1] Revenue reconciling amounts for the three months ended March 31, 2013 includes the recognition of: $1.1 billion of previously deferred revenue related to the Windows Upgrade Offer; $380 million of previously deferred revenue related to the sales of video games with the right to receive specified software upgrades/enhancements; $101 million of previously deferred revenue related to pre-sales of the new Office to original equipment manufacturers and retailers before general availability; and a net $92 million of previously deferred revenue related to the Office Upgrade Offer. Revenue reconciling amounts for the nine months ended March 31, 2013 includes a net $784 million of revenue deferred related to the Office Upgrade Offer and the recognition of $540 million of previously deferred revenue related to the Windows Upgrade Offer.