Elpida Memory, Inc. Elpida Memories, Inc. (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended
	Nov. 29, 2012	Jul. 31, 2013	Jul. 31, 2013 Elpida Company [Member]	Aug. 29, 2013 Elpida Company [Member]	Jul. 31, 2013 Rexchip Electronics Corporation, now known as Micron Memory Taiwan Co., Ltd. [Member]	Nov. 28, 2013 Rexchip Electronics Corporation, now known as Micron Memory Taiwan Co., Ltd. [Member]
Business Acquisition [Line Items]
Cash paid for the acquisition of Elpida			$ 615		$ 334
Rexchip Share Purchase Agreement [Abstract]
Percentage of equity acquired					24.00%
Business Acquisition, Equity Interest Held by Acquiree, Less than Wholly Owned Subsidiary, Ownership Percentage			65.00%
Ownership percentage after stock transactions during period (in hundredths)						89.00%
Total net assets acquired		2,601
Noncontrolling interests in Elpida		168
Gain on acquisition of Elpida				1,484
Business Acquisition, Pro Forma Information [Abstract]
Net sales	2,619
Net income (loss)	(226)
Net income (loss) attributable to Micron	$ (237)
Earnings (loss) per share: [Abstract]
Basic (in dollars per share)	$ (0.23)
Diluted (in dollars per share)	$ (0.23)