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Property, Plant and Equipment-Net (Tables)
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment, Net [Abstract]  
Components of 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.
Summary of plant turnaround activity 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