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Derivative and Hedging Activities (Tables)
9 Months Ended
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of estimated fair values of oil, natural gas and NGL derivative instruments
The estimated fair values of our oil and natural gas derivative instrument assets (liabilities) as of September 30, 2021 and December 31, 2020 are provided below: 
SuccessorPredecessor
 September 30, 2021December 31, 2020
Notional VolumeFair ValueNotional VolumeFair Value
Oil (MMBbl):
Fixed-price swaps18 $(464)27 $(136)
Basis protection swaps(3)(1)
Total oil27 (467)34 (137)
Natural gas (Bcf):
Fixed-price swaps429 (926)728 10 
Collars207 (171)53 
Basis protection swaps126 (46)66 
Total natural gas762 (1,143)847 19 
Total estimated fair value$(1,610)$(118)
Schedule of effect of derivative instruments, condensed consolidated balance sheets
The following table presents the fair value and location of each classification of derivative instrument included in the condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020 on a gross basis and after same-counterparty netting:
Gross
Fair Value
Amounts Netted
in the
Consolidated
Balance Sheets
Net Fair Value
Presented in the
Consolidated
Balance Sheets
Successor
As of September 30, 2021
Commodity Contracts:
Short-term derivative asset$14 $(14)$— 
Long-term derivative asset(7)— 
Short-term derivative liability(1,359)14 (1,345)
Long-term derivative liability(272)(265)
Total derivatives$(1,610)$— $(1,610)
Predecessor
As of December 31, 2020
Commodity Contracts:
Short-term derivative asset$84 $(65)$19 
Long-term derivative asset(5)— 
Short-term derivative liability(158)65 (93)
Long-term derivative liability(49)(44)
Total derivatives$(118)$— $(118)
Schedule of effect of derivative instruments, condensed consolidated statements of operations
The components of oil and natural gas derivatives are presented below:
 SuccessorPredecessor
Three Months Ended
September 30, 2021
Three Months Ended
September 30, 2020
Losses on undesignated oil and natural gas derivatives$(910)$(154)
Losses on terminated cash flow hedges— (7)
Total oil and natural gas derivatives$(910)$(161)

 SuccessorPredecessor
Period from February 10, 2021 through September 30, 2021Period from January 1, 2021 through February 9, 2021Nine Months Ended
September 30, 2020
Gains (losses) on undesignated oil and natural gas derivatives$(1,604)$(379)$597 
Losses on terminated cash flow hedges— (3)(24)
Total oil and natural gas derivatives$(1,604)$(382)$573 
Schedule of effect of derivative instruments, accumulated other comprehensive income (loss)
A reconciliation of the changes in accumulated other comprehensive income (loss) in our condensed consolidated statements of stockholders’ equity related to our cash flow hedges is presented below:
SuccessorPredecessor
Three Months Ended
September 30, 2021
Three Months Ended
September 30, 2020
Before 
Tax  
After 
Tax  
Before 
Tax
After 
Tax
Balance, beginning of period$— $— $(28)$29 
Losses reclassified to income
— — 
Balance, end of period$— $— $(21)$36 

SuccessorPredecessor
Period from February 10, 2021 through September 30, 2021Period from
 January 1, 2021 through
 February 9, 2021
Nine Months Ended
September 30, 2020
Before 
Tax  
After 
Tax  
Before 
Tax
After 
Tax
Before 
Tax  
After 
Tax  
Balance, beginning of period$— $— $(12)$45 $(45)$12 
Losses reclassified to income
— — 24 24 
Fresh start adjustments— — — — 
Elimination of tax effects— — — (57)— — 
Balance, end of period$— $— $— $— $(21)$36 
Schedule of financial assets (liabilities)
The following table provides information for financial assets (liabilities) measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020:
SuccessorPredecessor
Significant Other Observable Inputs (Level 2)September 30,
2021
December 31,
2020
Derivative Assets (Liabilities):
Commodity assets$21 $88 
Commodity liabilities(1,631)(206)
Total derivatives$(1,610)$(118)