Income Taxes	9 Months Ended
Oct. 02, 2021
Income Tax Disclosure [Abstract]
Income Taxes	11. Income Taxes The effective tax rate for the third quarter of 2021 was 22.5% compared to 23.3% for the third quarter of 2020. Nucor has concluded U.S. federal income tax matters for tax years through 2014 and for tax year 2016. The tax years 2015 and 2017 through 2020 remain open to examination by the Internal Revenue Service. The 2015 Canadian income tax returns for Harris Steel Group Inc. and certain related affiliates are currently under examination by the Canada Revenue Agency. The tax years 2014 through 2020 remain open to examination by other major taxing jurisdictions to which Nucor is subject (primarily Canada and other state and local jurisdictions). Non-current deferred tax liabilities included in deferred credits and other liabilities in the condensed consolidated balance sheets were $771.4 million at October 2, 2021 ($596.4 million at December 31, 2020).

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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