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PROPERTY, PLANT AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment, net
Property, plant and equipment, net consisted of the following:
SuccessorPredecessor
(in millions)December 31, 2020December 31, 2019
Proved oil and natural gas properties$2,416 $21,285 
Unproved oil and natural gas properties(a)
1,055 
Facilities and other272 549 
     Total property, plant and equipment2,689 22,889 
Accumulated depreciation, depletion and amortization
(34)(16,537)
Total property, plant and equipment, net
$2,655 $6,352 
(a)Includes a valuation allowance for unproved properties of zero and $823 million at December 31, 2020 and 2019, respectively.
Summary of the activity of capitalized exploratory well costs
The following table summarizes the activity of capitalized exploratory well costs:
SuccessorPredecessor
November 1, 2020 - December 31, 2020January 1, 2020 - October 31, 2020Years ended
December 31,
(in millions)20192018
Beginning balance$$$$
Additions to capitalized exploratory well costs — — 12 19 
Reclassification to property, plant and equipment — — (3)(2)
Charged to expense— (2)(7)(16)
Impact of fresh start accounting— (2)— — 
Ending balance$$$$