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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue by Segment The following table reconciles operating revenues as presented on the consolidated statements of operations to the operating revenues by segment:
(in millions)E&PMarketingIntersegment
Revenues		Total
Three months ended March 31, 2021
Gas sales$451 $— $13 $464 
Oil sales80 — 1 81 
NGL sales173 — — 173 
Marketing— 996 (644)352 
Other (1)
1 1 — 2 
Total$705 $997 $(630)$1,072 
Three months ended March 31, 2020
Gas sales$239 $— $9 $248 
Oil sales52 — — 52 
NGL sales50 — — 50 
Marketing— 548 (309)239 
Other (2)
3 — — 3 
Total$344 $548 $(300)$592 
(1)For the three months ended March 31, 2021, other E&P revenues consists primarily of gains on purchaser imbalances associated with certain NGLs and other Marketing revenues consists primarily of sales of gas from storage.
(2)For the three months ended March 31, 2020, other E&P revenues consists primarily of gains on purchaser imbalances associated with certain NGLs.
Disaggregation of Revenue on Geographic Basis
Associated E&P revenues are also disaggregated for analysis on a geographic basis by the core areas in which the Company operates, which are in Pennsylvania, West Virginia and Ohio.

For the three months ended March 31,
(in millions)20212020
Northeast Appalachia$263 $195 
Southwest Appalachia441 149 
Other1 — 
Total$705 $344 
Reconciliation of Accounts Receivable
The following table reconciles the Company’s receivables from contracts with customers to consolidated accounts receivable as presented on the consolidated balance sheet:

(in millions)March 31, 2021December 31, 2020
Receivables from contracts with customers$381 $350 
Other accounts receivable19 18 
Total accounts receivable$400 $368