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Property, Plant and Equipment-Net
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment-Net Property, Plant and Equipment—Net
Property, plant and equipment—net consists of the following:
 December 31,
 20242023
 (in millions)
Land$114 $114 
Machinery and equipment13,801 13,716 
Buildings and improvements1,011 1,020 
Construction in progress482 394 
Property, plant and equipment(1)
15,408 15,244 
Less: Accumulated depreciation and amortization8,673 8,103 
Property, plant and equipment—net$6,735 $7,141 
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(1)As of December 31, 2024 and 2023, we had property, plant and equipment that was accrued but unpaid of approximately $101 million and $68 million, respectively.

Depreciation and amortization related to property, plant and equipment was $921 million, $861 million and $838 million in 2024, 2023 and 2022, respectively.
Plant turnarounds—Scheduled inspections, replacements and overhauls of plant machinery and equipment at our continuous process manufacturing facilities during a full plant shutdown are referred to as plant turnarounds. The expenditures related to plant turnarounds are capitalized in property, plant and equipment when incurred.
Scheduled replacements and overhauls of plant machinery and equipment during a plant turnaround include the dismantling, repair or replacement and installation of various components including piping, valves, motors, turbines, pumps, compressors and heat exchangers and the replacement of catalysts. Scheduled inspections, including required safety inspections which entail the disassembly of various components such as steam boilers, pressure vessels and other equipment requiring safety certifications, are also conducted during plant turnarounds. Internal employee costs and overhead amounts are not considered plant turnaround costs and are not capitalized.
The following is a summary of capitalized plant turnaround costs:
 Year ended December 31,
 202420232022
 (in millions)
Net capitalized turnaround costs as of January 1$352 $312 $355 
Additions186 165 118 
Depreciation(171)(138)(134)
Impairment related to U.K. operations— — (21)
Acquisition of Waggaman ammonia production facility— 16 — 
Effect of exchange rate changes and other(4)(3)(6)
Net capitalized turnaround costs as of December 31$363 $352 $312