Equity - Treasury Stock (Details) - Inotera shares in Millions, $ in Millions	Dec. 06, 2016 USD ($) shares
Class of Stock [Line Items]
Cash proceeds received from issuance of Micron Shares to Nanya (treasury shares component)	$ 986
Private Placement
Class of Stock [Line Items]
Number of Micron Shares issued to Nanya as consideration for Inotera shares not already owned (in shares) | shares	58
Cash proceeds received from issuance of Micron Shares to Nanya (treasury shares component)	$ 986
Private Placement | Treasury Stock, Common
Class of Stock [Line Items]
Cash proceeds received from issuance of Micron Shares to Nanya (treasury shares component)	$ 925
Treasury shares included in sale of shares to Nanya | shares	54
Decrease in treasury stock as a result of the issuance of shares to Nanya	$ 1,030
Decrease in retained earnings due to reissuance of treasury shares at price lower than purchase price	$ 104