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Derivative and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of estimated fair value of oil, natural gas and NGL derivative instrument asset (liabilities)
The estimated fair values of our oil and natural gas derivative instrument assets (liabilities) as of December 31, 2021 and 2020 are provided below: 
SuccessorPredecessor
 December 31, 2021December 31, 2020
Notional VolumeFair ValueNotional VolumeFair Value
Oil (mmbbl):
Fixed-price swaps13 $(356)27 $(136)
Basis protection swaps9 (2)7 (1)
Total oil22 (358)34 (137)
Natural gas (bcf):
Fixed-price swaps637 (675)728 10 
Collars205 (82)53 8 
Call options18 (17)— — 
Basis protection swaps252 (11)66 1 
Total natural gas1,112 (785)847 19 
Total estimated fair value$(1,143)$(118)
Schedule of effects of dividend instruments in consolidated balance sheets
The following table presents the fair value and location of each classification of derivative instrument included in the consolidated balance sheets as of December 31, 2021 and 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 December 31, 2021
Commodity Contracts:
Short-term derivative asset$56 $(51)$5 
Short-term derivative liability(950)51 (899)
Long-term derivative liability(249)— (249)
Total derivatives$(1,143)$— $(1,143)
Predecessor
As of December 31, 2020
Commodity Contracts:
Short-term derivative asset$84 $(65)$19 
Long-term derivative asset5 (5)— 
Short-term derivative liability(158)65 (93)
Long-term derivative liability(49)5 (44)
Total derivatives$(118)$— $(118)
Schedule of effects of derivative instruments in consolidated statements of operations
The components of oil and natural gas derivatives are presented below:
 SuccessorPredecessor
 Period from February 10, 2021 through December 31, 2021Period from January 1, 2021 through February 9, 2021Year Ended December 31, 2020Year Ended December 31, 2019
Gains (losses) on undesignated oil and natural gas derivatives$(1,127)$(379)$629 $40 
Losses on terminated cash flow hedges— (3)(33)(35)
Total oil and natural gas derivatives$(1,127)$(382)$596 $5 
Schedule of effects of derivative instruments in accumulated other comprehensive income (loss)
A reconciliation of the changes in accumulated other comprehensive income (loss) in our consolidated statements of stockholders’ equity related to our cash flow hedges is presented below:
SuccessorPredecessor
Period from February 10, 2021 through December 31, 2021Period from
 January 1, 2021 through
 February 9, 2021		Year Ended December 31, 2020Year Ended December 31, 2019
Before 
Tax  		After 
Tax  		Before 
Tax		After 
Tax		Before 
Tax  		After 
Tax  		Before 
Tax		After 
Tax
Balance, beginning of period$— $— $(12)$45 $(45)$12 $(80)$(23)
Losses reclassified to income— — 3 3 33 33 35 35 
Fresh start adjustments— — 9 9 — — — — 
Elimination of tax effects— — — (57)— — — — 
Balance, end of period$— $— $— $— $(12)$45 $(45)$12 
Schedule of fair value measurement of financial assets (liabilities) measured at fair value on a recurring basis
The following table provides information for financial assets (liabilities) measured at fair value on a recurring basis as of December 31, 2021 and 2020:
SuccessorPredecessor
Significant Other Observable Inputs (Level 2)December 31,
2021		December 31,
2020
Derivative Assets (Liabilities):
Commodity assets$56 $88 
Commodity liabilities(1,199)(206)
Total derivatives$(1,143)$(118)