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Revenue Recognition
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Performance Obligations
As of September 30, 2019, estimated future fixed fee performance obligations are $136 million for the remaining three months of fiscal year 2019, and $532 million, $586 million, $297 million and $29 million for the entirety of fiscal years 2020, 2021, 2022 and 2023, respectively. These performance obligations are for cleared auction MWs in the PJM, ISO-NE, NYISO and MISO capacity auctions and are subject to penalties for non performance.
Disaggregated Revenues  
The following tables represent the Company’s disaggregation of revenue from contracts with customers for the three and nine months ended September 30, 2019 and 2018 along with the reportable segment for each category:
Three months ended September 30, 2019
Generation
(In millions)
RetailTexasEast/West/OtherSubtotalCorporate/EliminationsTotal
Energy revenue(a)(c)
$—  $773  $237  $1,010  $(568) $442  
Capacity revenue(c)
—  —  151  151  1  152  
Retail revenue
Mass customers2,080  —  —  —  —  2,080  
Business Solutions customers 465  —  —  —  —  465  
Total retail revenue2,545  —  —  —  —  2,545  
Mark-to-market for economic hedging activities(a)(b)
(1) (240) (16) (256) 47  (210) 
Other revenues(c)
—  32  37  69  (2) 67  
Total operating revenue2,544  565  409  974  (522) 2,996  
Less: Lease revenue3  —  2  2  —  5  
Less: Realized and unrealized ASC 815 revenue(a)
(1) 944  66  1,010  (522) 487  
Total revenue from contracts with customers$2,542  $(379) $341  $(38) $—  $2,504  
(a) Generation includes higher revenues due to the Company's large internal transfer of power based on average annualized market prices, which are offset by higher
       cost of operations within Retail
(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
(c) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above:
RetailTexasEast/West/OtherSubtotalCorporate/EliminationsTotal
Energy revenue$—  $1,175  $62  $1,237  $(569) $668  
Capacity revenue—  —  33  33  —  33  
Other revenue—  9  (13) (4) —  (4) 
Three months ended September 30, 2018
Generation
(In millions)
RetailTexasEast/West/OtherSubtotalCorporate/EliminationsTotal
Energy revenue(a)(c)
$—  $585  $339  $924  $(479) $445  
Capacity revenue(c)
—  1  190  191  1  192  
Retail revenue
Mass customers1,768  —  —  —  (2) 1,766  
Business Solutions customers 434  —  —  —  —  434  
Total retail revenue2,202  —  —  —  (2) 2,200  
Mark-to-market for economic hedging activities(a)(b)
1  259  36  295  (241) 55  
Other revenues(c)
—  8  60  68  —  68  
Total operating revenue2,203  853  625  1,478  (721) 2,960  
Less: Lease revenue3  —  3  3  —  6  
Less: Realized and unrealized ASC 815 revenue(a)
1  1,159  79  1,238  (716) 523  
Total revenue from contracts with customers$2,199  $(306) $543  $237  $(5) $2,431  
(a) Generation includes higher revenues due to the Company's large internal transfer of power based on average annualized market prices, which are offset by higher
       cost of operations within Retail
(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
(c) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above:
RetailTexasEast/West/OtherSubtotalCorporate/EliminationsTotal
Energy revenue$—  $901  $(8) $893  $(475) $418  
Capacity revenue—  —  45  45  —  45  
Other revenue—  (1) 6  5  —  5  
Nine months ended September 30, 2019
Generation
(In millions)
RetailTexasEast/West/OtherSubtotalCorporate/EliminationsTotal
Energy revenue(a)(c)
$—  $1,628  $578  $2,206  $(1,209) $997  
Capacity revenue(c)
—  —  460  460  1  461  
Retail revenue
Mass customers4,802  —  —  —  (2) 4,800  
Business Solutions customers 1,096  —  —  —  —  1,096  
Total retail revenue5,898  —  —  —  (2) 5,896  
Mark-to-market for economic hedging activities(a)(b)
1  233  40  273  (223) 51  
Other revenues(c)
—  77  148  225  (4) 221  
Total operating revenue5,899  1,938  1,226  3,164  (1,437) 7,626  
Less: Lease revenue9  —  6  6  —  15  
Less: Realized and unrealized ASC 815 revenue(a)
1  2,674  303  2,977  (1,433) 1,545  
Total revenue from contracts with customers$5,889  $(736) $917  $181  $(4) $6,066  
(a) Generation includes higher revenues due to the Company's large internal transfer of power based on average annualized market prices, which are offset by higher
       cost of operations within Retail
(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
(c) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above:
RetailTexasEast/West/OtherSubtotalCorporate/EliminationsTotal
Energy revenue$—  $2,417  $192  $2,609  $(1,211) $1,398  
Capacity revenue—  —  80  80  1  81  
Other revenue—  24  (9) 15  —  15  

Nine months ended September 30, 2018
Generation
(In millions)
RetailTexasEast/West/OtherSubtotalCorporate/EliminationsTotal
Energy revenue(a)(c)
$—  $1,251  $937  $2,188  $(890) $1,298  
Capacity revenue(c)
—  1  498  499  1  500  
Retail revenue
Mass customers4,321  —  —  —  (4) 4,317  
Business Solutions customers 1,181  —  —  —  —  1,181  
Total retail revenue5,502  —  —  —  (4) 5,498  
Mark-to-market for economic hedging activities(a)(b)
(5) (14) 9  (5) (21) (31) 
Other revenues(c)
—  72  162  234  (13) 221  
Total operating revenue5,497  1,310  1,606  2,916  (927) 7,486  
Less: Lease revenue10  —  7  7  —  17  
Less: Realized and unrealized ASC 815 revenue(a)
(5) 1,872  211  2,083  (901) 1,177  
Total revenue from contracts with customers$5,492  $(562) $1,388  $826  $(26) $6,292  
(a) Generation includes higher revenues due to the Company's large internal transfer of power based on average annualized market prices, which are offset by higher
       cost of operations within Retail
(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
(c) The following table represents the realized revenues related to derivative instruments that are accounted for under ASC 815 and included in the amounts above:
RetailTexasEast/West/OtherSubtotalCorporate/EliminationsTotal
Energy revenue$—  $1,883  $78  $1,961  $(880) $1,081  
Capacity revenue—  —  110  110  —  110  
Other revenue—  3  14  17  —  17  
Contract Balances
The following table reflects the contract assets and liabilities included in the Company’s balance sheet as of September 30, 2019 and December 31, 2018:
(In millions)
September 30, 2019December 31, 2018
Deferred customer acquisition costs$130  $111  
Accounts receivable, net - Contracts with customers1,311  999  
Accounts receivable, net - Derivative instruments63  20  
Accounts receivable, net - Affiliate4  5  
Total accounts receivable, net $1,378  $1,024  
Unbilled revenues (included within Accounts receivable, net - Contracts with customers)$486  $392  
Deferred revenues(a)
78  67  
(a) Deferred revenues from contracts with customers for the nine months ended September 30, 2019 and the year ended December 31, 2018 were approximately $25 million and $19 million, respectively
The revenue recognized from contracts with customers during the nine months ended September 30, 2019 and 2018 relating to the deferred revenue balance at the beginning of each period was $13 million and $16 million, respectively. The revenue recognized from contracts with customers during the three months ended September 30, 2019 and 2018 relating to the deferred revenue balance at the beginning of each period was $21 million and $19 million, respectively. The change in deferred revenue balances during the three and nine months ended September 30, 2019 and 2018 was primarily due to the timing difference of when consideration was received and when the performance obligation was transferred.