Organization and Summary of Significant Accounting Policies (Summary of NNN's Investment Portfolio) (Details)	12 Months Ended
	Dec. 31, 2023 ft² Property State
Property Portfolio:
Total properties | Property	3,532
Gross leasable area (square feet) | ft²	35,966,000
States | State	49
Weighted average remaining lease term (years)	10 years 1 month 6 days