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Property, Plant and Equipment-Net (Tables)
 9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment, Net [Abstract]  
Components of property, plant and equipment-net
Property, plant and equipment—net consists of the following:
 September 30, 2020December 31, 2019
 (in millions)
Land$67 $71 
Machinery and equipment12,389 12,338 
Buildings and improvements891 890 
Construction in progress307 236 
Property, plant and equipment(1)
13,654 13,535 
Less: Accumulated depreciation and amortization5,930 5,365 
Property, plant and equipment—net$7,724 $8,170 
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(1)As of September 30, 2020 and December 31, 2019, we had property, plant and equipment that was accrued but unpaid of approximately $73 million and $42 million, respectively. As of September 30, 2019 and December 31, 2018, we had property, plant and equipment that was accrued but unpaid of $61 million and $48 million, respectively.
Summary of plant turnaround activity The following is a summary of capitalized plant turnaround costs:
 Nine months ended 
 September 30,
 20202019
 (in millions)
Net capitalized turnaround costs:  
Beginning balance$246 $252 
Additions68 94 
Depreciation(77)(85)
Effect of exchange rate changes(2)— 
Ending balance$235 $261