Revenue - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Revenue From Contract With Customers [Line Items]
Contract with customer, timing of satisfaction of performance obligation and payment	The durations of Nucor’s contracts with customers are generally one year or less. Customer payment terms are generally 30 days.
Contract liabilities	$ 200	$ 314
Revenue recognized from contract liabilities	$ 177
Nucor Racking Group [Member]
Revenue From Contract With Customers [Line Items]
Contract with customer, timing of satisfaction of performance obligation and payment	three and six months
Steel Mills [Member]
Revenue From Contract With Customers [Line Items]
Contract with customer, timing of satisfaction of performance obligation and payment	one year or less