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Contingencies (Details) ¥ in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 21, 2020 lawsuit | Dec. 03, 2020 CNY (¥) lawsuit patent agreement | Dec. 03, 2020 USD ($) lawsuit patent agreement | Aug. 30, 2018
Pending Litigation | Micron vs United Microelectronics Corp and Fujian Jinhua Integrated Circuit Co |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Pending Litigation | Micron Intel JV Arbitration Matter | Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Agreements Allegedly Breached, Number | agreement |  | 1 | 1 |
Pending Litigation | Allied Telesis K.K. vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Under Appeal | Qimonda AG Inotera Share Purchase Proceedings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Percentage of total Inotera shares subject to litigation (in hundredths) |  | 18.00% | 18.00% |
Loss contingency, judgment under appeal | $ |  |  | $ 1 |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Under Appeal | Employee Class Action vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Patent Matters | Innovative Memory Solutions, Inc. vs Micron-Complaint 1 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 8 | 8 |
Patent Matters | Pending Litigation | MLC Intellectual Property, LLC vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 1 | 1 |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Patent Matters | Pending Litigation | Elm 3DS Innovations, LLC vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 13 | 13 |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Patent Matters | Pending Litigation | Innovative Memory Solutions, Inc. vs Micron-Complaint 1 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 2 | 2 |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Patent Matters | Pending Litigation | Fujian Jinhua Integrated Circuit Co., Ltd. vs Micron-Complaint 1 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 1 | 1 |
Damages sought on alleged patent infringement | ¥ |  | ¥ 98 |  |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Patent Matters | Pending Litigation | Fujian Jinhua Integrated Circuit Co., Ltd. vs Micron-Complaint 2 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 1 | 1 |
Damages sought on alleged patent infringement | ¥ |  | ¥ 98 |  |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Patent Matters | Pending Litigation | United Microelectronics Corporation vs Micron-Complaint 1 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 1 | 1 |
Damages sought on alleged patent infringement | ¥ |  | ¥ 90 |  |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Patent Matters | Pending Litigation | United Microelectronics Corporation vs Micron-Complaint 2 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 1 | 1 |
Damages sought on alleged patent infringement | ¥ |  | ¥ 90 |  |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Patent Matters | Pending Litigation | Fuzhou Court Preliminary Injunction |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Percent of annualized revenue derived from impacted products |  |  |  | 1.00%
Patent Matters | Pending Litigation | Flash-Control, LLC vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 4 | 4 |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |
Patent Matters | Withdrawn Litigation | Innovative Memory Solutions, Inc. vs Micron-Complaint 1 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 6 | 6 |
Patent Matters | Withdrawn Litigation | United Microelectronics Corporation vs Micron-Complaint 3 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of patents allegedly infringed | patent |  | 1 | 1 |
Damages sought on alleged patent infringement | ¥ |  | ¥ 90 |  |
Loss Contingency, Claims Withdrawn, Number |  | 1 | 1 |
Antitrust Matters | Pending Litigation | DRAM Purchasers Canada vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Pending Claims, Number |  | 6 | 6 |
Antitrust Matters | Joined Litigation | Initial direct DRAM Purchasers United States vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Claims Joined, Number |  | 1 | 1 |
Antitrust Matters | Joined Litigation | Subsequent direct DRAM Purchasers United States vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Claims Joined, Number |  | 4 | 4 |
Antitrust Matters | Dismissed Litigation | Initial indirect DRAM Purchasers United States vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Claims Dismissed, Number |  | 1 | 1 |
Antitrust Matters | Dismissed Litigation | Subsequent indirect DRAM Purchasers United States vs Micron |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Claims Dismissed, Number |  | 2 | 2 |
Antitrust Matters | Dismissed Litigation | Consolidated Amended Indirect Purchasers CA vs Micron | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Claims Dismissed, Number | 1 |  |  |
Antitrust Matters | Dismissed Litigation | Consolidated Amended Direct Purchasers CA vs Micron | Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Claims Dismissed, Number | 1 |  |  |
Securities Matters | Pending Litigation | Shareholder Class Action Delaware Court vs Micron. |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Pending Claims, Number |  | 1 | 1 |

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