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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value Disclosures [Abstract] |  |
Fair value of short-term and long-term debt, including current maturities | $ 6,050 | $ 4,810

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- Definition The fair value amount of short-term and long-term debt, including current maturities, whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | nue_ShortAndLongTermDebtFairValue
Namespace Prefix: | nue_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration