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Debt and Other Financing Arrangements - Additional Information (Detail) - USD ($)		1 Months Ended				12 Months Ended
	Nov. 05, 2021	Aug. 31, 2021	Dec. 31, 2020	Jul. 31, 2020	May 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Annual aggregate long-term debt maturities - 2022						$ 601,000,000.0
Annual aggregate long-term debt maturities - 2023						500,000,000.0
Annual aggregate long-term debt maturities - 2024						0
Annual aggregate long-term debt maturities - 2025						500,000,000.0
Annual aggregate long-term debt maturities - 2026						21,500,000
Annual aggregate long-term debt maturities - thereafter						3,980,000,000
Net proceeds of debt issuances					$ 989,400,000
Debt issuance costs			$ 30,854,000		8,400,000	$ 27,299,000	$ 30,854,000
Payment of premium component of debt exchange			180,300,000				180,383,000
Ratio funded debt to total capital						28.00%
Short-term borrowings			57,906,000			$ 107,723,000	57,906,000
Harris Steel [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity						18,400,000
Line of credit			0			0	0
Nucor Trading S.A. [Member]
Debt Instrument [Line Items]
Short-term borrowings			57,900,000			107,700,000	57,900,000
Amended and Restated Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity			1,500,000,000			1,750,000,000	1,500,000,000
Line of revolving credit facility expiration date	Nov. 05, 2026
Ratio on the limit of funded debt to capital on credit facility	60.00%
Line of credit						0		$ 0
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 100,000,000.0
Line of credit			63,300,000			98,700,000	63,300,000
Additional Commitments at Nucor's Election in Accordance with Terms of Credit Agreement [Member] \| Amended and Restated Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility availability	$ 500,000,000.0
Revolving Loans For Nucor Subsidiaries [Member] \| Amended and Restated Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity						500,000,000.0
Variable Rate Green Bonds [Member]
Debt Instrument [Line Items]
Issuance of bonds		$ 197,000,000.0		$ 162,600,000
Debt instrument, term		40 years		40 years
Notes, 2.000%, due 2025 [Member]
Debt Instrument [Line Items]
Debt instrument face amount					$ 500,000,000.0
Debt instrument interest rate					2.00%
Debt instrument - maturity year					2025
Notes, 2.700%, due 2030 [Member]
Debt Instrument [Line Items]
Debt instrument face amount					$ 500,000,000.0
Debt instrument interest rate					2.70%
Debt instrument - maturity year					2030
Notes, 2.979%, due 2055 [Member]
Debt Instrument [Line Items]
Debt instrument face amount			439,312,000			$ 439,312,000	439,312,000
Debt instrument interest rate						2.979%
Debt instrument - maturity year						2055
Notes, 2.979%, due 2055 [Member] \| Exchanged Debt [Member]
Debt Instrument [Line Items]
Debt instrument face amount			$ 439,300,000				$ 439,300,000
Debt instrument interest rate			2.979%				2.979%
Debt instrument - maturity year			2055
Notes, 6.400%, due 2037 [Member]
Debt Instrument [Line Items]
Debt instrument face amount			$ 543,331,000			$ 543,331,000	$ 543,331,000
Debt instrument interest rate						6.40%
Debt instrument - maturity year						2037
Notes, 6.400%, due 2037 [Member] \| Exchanged Debt [Member]
Debt Instrument [Line Items]
Debt instrument face amount			$ 106,700,000				$ 106,700,000
Debt instrument interest rate			6.40%				6.40%
Debt instrument - maturity year			2037
Notes, 5.200%, due 2043 [Member]
Debt Instrument [Line Items]
Debt instrument face amount			$ 338,133,000			$ 338,133,000	$ 338,133,000
Debt instrument interest rate						5.20%
Debt instrument - maturity year						2043
Notes, 5.200%, due 2043 [Member] \| Exchanged Debt [Member]
Debt Instrument [Line Items]
Debt instrument face amount			$ 161,900,000				$ 161,900,000
Debt instrument interest rate			5.20%				5.20%
Debt instrument - maturity year			2043
Notes, 4.400%, due 2048 [Member]
Debt Instrument [Line Items]
Debt instrument face amount			$ 329,219,000			$ 329,219,000	$ 329,219,000
Debt instrument interest rate						4.40%
Debt instrument - maturity year						2048
Notes, 4.400%, due 2048 [Member] \| Exchanged Debt [Member]
Debt Instrument [Line Items]
Debt instrument face amount			$ 170,800,000				$ 170,800,000
Debt instrument interest rate			4.40%				4.40%
Debt instrument - maturity year			2048