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Revenue
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue
8.Revenue
The following table shows revenue disaggregated by operating area and product type:
Successor
Three Months Ended September 30, 2021
OilNatural GasNGLTotal
Appalachia$— $383 $— $383 
Gulf Coast— 207 — 207 
South Texas221 44 47 312 
Brazos Valley158 9 8 175 
Powder River Basin58 21 14 93 
Oil, natural gas and NGL revenue$437 $664 $69 $1,170 
Marketing revenue
$326 $240 $61 $627 
Predecessor
Three Months Ended September 30, 2020
 OilNatural GasNGLTotal
Appalachia$— $137 $— $137 
Gulf Coast— 92 — 92 
South Texas189 26 26 241 
Brazos Valley127 3 3 133 
Powder River Basin36 7 4 47 
Mid-Continent14 5 3 22 
Oil, natural gas and NGL revenue$366 $270 $36 $672 
Marketing revenue
$301 $116 $31 $448 
Successor
Period from
February 10, 2021 through September 30, 2021
OilNatural GasNGLTotal
Appalachia$— $772 $— $772 
Gulf Coast— 401 — 401 
South Texas562 97 102 761 
Brazos Valley409 30 17 456 
Powder River Basin144 51 30 225 
Oil, natural gas and NGL revenue$1,115 $1,351 $149 $2,615 
Marketing revenue
$828 $483 $132 $1,443 
Predecessor
Period from
January 1, 2021 through February 9, 2021
 OilNatural GasNGLTotal
Appalachia$— $119 $— $119 
Gulf Coast— 53 — 53 
South Texas92 15 15 122 
Brazos Valley67 2 2 71 
Powder River Basin20 7 6 33 
Oil, natural gas and NGL revenue$179 $196 $23 $398 
Marketing revenue
$141 $78 $20 $239 
Predecessor
Nine Months Ended September 30, 2020
 OilNatural GasNGLTotal
Appalachia$— $445 $— $445 
Gulf Coast— 245 — 245 
South Texas539 77 59 675 
Brazos Valley375 10 9 394 
Powder River Basin1332814175 
Mid-Continent44 19 9 72 
Oil, natural gas and NGL revenue$1,091 $824 $91 $2,006 
Marketing revenue from contracts with customers$930 $338 $76 $1,344 
Other marketing revenue67 1 — 68 
Marketing revenue
$997 $339 $76 $1,412 
Accounts Receivable
Our accounts receivable are primarily from purchasers of oil, natural gas and NGL and from exploration and production companies that own interests in properties we operate. This industry concentration could affect our overall exposure to credit risk, either positively or negatively, because our purchasers and joint working interest owners may be similarly affected by changes in economic, industry or other conditions. We monitor the creditworthiness of all our counterparties and we generally require letters of credit or parent guarantees for receivables from parties deemed to have sub-standard credit, unless the credit risk can otherwise be mitigated. We estimate expected credit losses using forecasts based on historical information and current information, in addition to specifically identifying receivables that may be uncollectible.
Accounts receivable as of September 30, 2021 and December 31, 2020 are detailed below:
SuccessorPredecessor
September 30,
2021		December 31,
2020
Oil, natural gas and NGL sales
$670 $589 
Joint interest
105 119 
Other
41 68 
Allowance for doubtful accounts
(1)(30)
Total accounts receivable, net
$815 $746