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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2019
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&PMidstreamIntersegment
Revenues		Total
Three months ended September 30, 2019    
Gas sales$230  $—  $8  $238  
Oil sales66  —  1  67  
NGL sales52  —  —  52  
Marketing—  592  (313) 279  
Total$348  $592  $(304) $636  
Three months ended September 30, 2018
Gas sales$460  $—  $5  $465  
Oil sales61  —  1  62  
NGL sales112  —  —  112  
Marketing—  846  (559) 287  
Gas gathering (1)
—  66  (41) 25  
Total$633  $912  $(594) $951  

(in millions)E&PMidstreamIntersegment
Revenues		Total
Nine months ended September 30, 2019
Gas sales$918  $—  $25  $943  
Oil sales151  —  2  153  
NGL sales191  —  —  191  
Marketing—  2,158  (1,154) 1,004  
Other (2)
1  1  —  2  
Total$1,261  $2,159  $(1,127) $2,293  
Nine months ended September 30, 2018
Gas sales$1,395  $—  $17  $1,412  
Oil sales139  —  2  141  
NGL sales252  —  —  252  
Marketing—  2,403  (1,598) 805  
Gas gathering (1)
—  202  (129) 73  
Other (2)
4  —  —  4  
Total$1,790  $2,605  $(1,708) $2,687  
(1)The Company’s gas gathering assets were divested in December 2018 as part of the Fayetteville Shale sale.
(2)Other E&P revenues consists primarily of water sales to third-party operators, and other Midstream revenues consists primarily of sales of gas from storage.
Disaggregation of Revenue on Geographic Basis
For the three months ended September 30,For the nine months ended September 30,
(in millions)2019201820192018
Northeast Appalachia$175  $254  $740  $794  
Southwest Appalachia173  235  519  557  
Fayetteville Shale—  140  —  431  
Other—  4  2  8  
Total$348  $633  $1,261  $1,790  
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)September 30, 2019December 31, 2018
Receivables from contracts with customers$235  $494  
Other accounts receivable88  87  
Total accounts receivable$323  $581