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Property, Plant and Equipment-Net (Tables)
 3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment, Net [Abstract]  
Components of property, plant and equipment-net
Property, plant and equipment—net consists of the following:
 March 31, 
 2021		December 31,  
 2020
 (in millions)
Land$68 $68 
Machinery and equipment12,597 12,539 
Buildings and improvements898 895 
Construction in progress294 275 
Property, plant and equipment(1)
13,857 13,777 
Less: Accumulated depreciation and amortization6,365 6,145 
Property, plant and equipment—net$7,492 $7,632 
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(1)As of March 31, 2021 and December 31, 2020, we had property, plant and equipment that was accrued but unpaid of approximately $33 million and $43 million, respectively. As of March 31, 2020 and December 31, 2019, we had property, plant and equipment that was accrued but unpaid of approximately $36 million and $42 million, respectively.
Summary of plant turnaround activity The following is a summary of capitalized plant turnaround costs:
 Three months ended 
 March 31,
 20212020
 (in millions)
Net capitalized turnaround costs:  
Beginning balance$226 $246 
Additions10 7 
Depreciation(25)(25)
Effect of exchange rate changes— (5)
Ending balance$211 $223