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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2020
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 June 30, 2020
Gas sales$155  $—  $9  $164  
Oil sales16  —  3  19  
NGL sales40  —  —  40  
Marketing—  389  (202) 187  
Total$211  $389  $(190) $410  
Three months ended June 30, 2019
Gas sales$267  $—  $8  $275  
Oil sales46  —  1  47  
NGL sales58  —  —  58  
Marketing—  626  (339) 287  
Total$371  $626  $(330) $667  

(in millions)E&PMarketingIntersegment
Revenues		Total
Six months ended June 30, 2020
Gas sales$394  $—  $18  $412  
Oil sales68  —  3  71  
NGL sales90  —  —  90  
Marketing—  937  (511) 426  
Other (1)
3  —  —  3  
Total$555  $937  $(490) $1,002  
Six months ended June 30, 2019
Gas sales$688  $—  $17  $705  
Oil sales85  —  1  86  
NGL sales139  —  —  139  
Marketing—  1,566  (841) 725  
Other (2)
1  1  —  2  
Total$913  $1,567  $(823) $1,657  
(1)For the six months ended June 30, 2020, other E&P revenues consists primarily of gains on purchaser imbalances associated with certain NGLs.
(2)For the six months ended June 30, 2019, other E&P revenues consists primarily of water sales to third-party operators, and other Marketing revenues consists primarily of sales of gas from storage.
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 and West Virginia.

For the three months ended June 30,For the six months ended June 30,
(in millions)2020201920202019
Northeast Appalachia$117  $217  $312  $565  
Southwest Appalachia94  153  243  346  
Other—  1  —  2  
Total$211  $371  $555  $913  
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)June 30, 2020December 31, 2019
Receivables from contracts with customers$183  $284  
Other accounts receivable67  61  
Total accounts receivable$250  $345