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Property, Plant and Equipment-Net
 12 Months Ended
Dec. 31, 2021
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,
 20212020
 (in millions)
Land$68 $68 
Machinery and equipment(1)
12,757 12,539 
Buildings and improvements(1)
915 895 
Construction in progress(1)
148 275 
Property, plant and equipment(2)
13,888 13,777 
Less: Accumulated depreciation and amortization6,807 6,145 
Property, plant and equipment—net$7,081 $7,632 
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(1)As of December 31, 2021, machinery and equipment, buildings and improvements, and construction in progress include impairment charges in 2021 of $169 million, $5 million and $8 million, respectively.
(2)As of December 31, 2021 and 2020, we had property, plant and equipment that was accrued but unpaid of approximately $35 million and $43 million, respectively.

Depreciation and amortization related to property, plant and equipment was $871 million, $876 million and $855 million in 2021, 2020 and 2019, respectively.
Asset impairment—During the third quarter of 2021, in light of the substantial increase in natural gas prices in the United Kingdom and its estimated impact on our U.K. operations, we identified a triggering event indicating possible impairment of the long-lived assets related to our U.K. manufacturing facilities within our Ammonia, AN and Other segments, including property, plant, and equipment. Accordingly, we performed a recoverability test on the U.K. Ammonia, U.K. AN and U.K. Other asset groups’ long-lived assets as of September 30, 2021. Our assets groups are the same as our reporting units. The recoverability tests were based on forecasts of undiscounted cash flows within each of our U.K. asset groups. The results of the recoverability tests indicated that the long-lived assets within our U.K. Ammonia, U.K. AN and U.K. Other asset groups were not fully recoverable. As a result, long-lived asset impairment charges of $236 million were recorded. The amount of the impairment that was allocated to property, plant and equipment was $182 million.
In the fourth quarter of 2021, natural gas prices in the United Kingdom continued to rise, which triggered an additional impairment test of the long-lived assets in our U.K. asset groups. This test indicated that no additional long-lived asset impairment should be recorded as the undiscounted cash flows were in excess of the carrying values for each of the U.K. asset groups. Long-lived assets on our consolidated balance sheet as of December 31, 2021 include approximately $425 million related to the U.K. asset groups, which primarily consists of approximately $385 million of property, plant and equipment. See Note 6—United Kingdom Energy Crisis and Impairment Charges and Note 8—Goodwill and Other Intangible Assets for additional information.
Sale of Pine Bend facility—In 2019, we sold our Pine Bend dry bulk storage and logistics facility in Minnesota, received proceeds of $55 million and recognized a pre-tax gain of $45 million. The gain is reflected in other operating—net in our consolidated statement of operations for the year ended December 31, 2019.
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 turnarounds are capitalized in property, plant and equipment when incurred. The following is a summary of capitalized plant turnaround costs:
 Year ended December 31,
 202120202019
 (in millions)
Net capitalized turnaround costs at beginning of the year$226 $246 $252 
Additions250 84 102 
Depreciation(121)(104)(112)
Effect of exchange rate changes— — 4 
Net capitalized turnaround costs at end of the year$355 $226 $246 
Scheduled replacements and overhauls of plant machinery and equipment include the dismantling, repair or replacement and installation of various components including piping, valves, motors, turbines, pumps, compressors, heat exchangers and the replacement of catalysts when a full plant shutdown occurs. Scheduled inspections are also conducted during full plant shutdowns, including required safety inspections which entail the disassembly of various components such as steam boilers, pressure vessels and other equipment requiring safety certifications. Internal employee costs and overhead amounts are not considered turnaround costs and are not capitalized.