Micron Japan Fabrication Facility (Details) (USD $) In Millions	1 Months Ended
Jun. 30, 2011	Jun. 02, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventories		$ 38
Property, plant, and equipment		56
Other assets		3
Accounts payable and accrued expenses		(5)
Capital lease obligations		(8)
Other noncurrent liabilities, including $9 million unrecognized pension expense in other comprehensive income		(61)
Net carrying value of assets sold and liabilities transferred		23
Japan Fab [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Receipt of cash related to Japan Fab disposition	40
Tower Semiconductor Ltd. shares received in Japan Fab disposition (in shares)		20
Amount of future payments to be received in connection with the divestiture of the Japan Fab		20
Gain recognized in Japan Fab disposition		54
Transaction costs included in gain recognized in Japan Fab disposition		3
Net charge for the gain and write down of certain tax assets associated with the Japan Fab disposition		74
Unrecognized pension expense in other comprehensive income included in other noncurrent liabilities		$ 9

For the disposal group, including a component of the entity (discontinued operation), carrying value of (a) obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business, or (b) costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include interest, rent, salaries, and utilities.

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Balance Type:	credit
Period Type:	instant

- Definition

For the disposal group, including a component of the entity (discontinued operation), carrying value of capital lease obligations.

+ Details

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Balance Type:	credit
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- Definition

For the disposal group, including a component of the entity (discontinued operation), the net carrying value of assets sold and liabilities transferred.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The remaining amount of cash consideration in the disposition of the Japan Fab to be received in twelve equal monthly installments beginings in the second quarter of 2012.

+ Details

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Namespace Prefix:	mu
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of ordinary shares received as partial consideration received in the disposition of the Japan Fab.

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The gain resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The loss resulting from the write-down of the carrying value of certain tax assets classified within a disposal group, but one which is not further classified as a discontinued operation, to fair value. The loss is included in income taxes in the income statement.

+ Details

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Namespace Prefix:	mu
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For the disposal group, including a component of the entity (discontinued operation), carrying amount of inventories (net of all valuation allowances and write-downs).

+ References