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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following tables represent the Company’s disaggregation of revenue from contracts with customers for the years ended December 31, 2019 and 2018:
| For the Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |  |
(In millions) | Texas |  | East |  | West/Other |  |  |  | Corporate/Eliminations |  | Total
Retail revenue |  |  |  |  |  |  |  |  |  |  |
Mass Market | $ | 5,027 |  |  | $ | 1,230 |  |  | $ | — |  |  |  |  | $ | (3) |  |  | $ | 6,254 |
Business Solutions | 1,205 |  |  | 74 |  |  | — |  |  |  |  | — |  |  | 1,279 |
Total retail revenue | 6,232 |  |  | 1,304 |  |  | — |  |  |  |  | (3) |  |  | 7,533 |
Energy revenue(a) | 529 |  |  | 322 |  |  | 318 |  |  |  |  | — |  |  | 1,169 |
Capacity revenue(a) | — |  |  | 664 |  |  | 36 |  |  |  |  | — |  |  | 700 |
Mark-to-market for economic hedging activities(b) | 47 |  |  | (29) |  |  | 16 |  |  |  |  | (1) |  |  | 33 |
Other revenue(a) | 261 |  |  | 58 |  |  | 70 |  |  |  |  | (3) |  |  | 386 |
Total operating revenue | 7,069 |  |  | 2,319 |  |  | 440 |  |  |  |  | (7) |  |  | 9,821 |
Less: Lease revenue | — |  |  | 1 |  |  | 19 |  |  |  |  | — |  |  | 20 |
Less: Realized and unrealized ASC 815 revenue | 1,562 |  |  | 183 |  |  | 67 |  |  |  |  | (2) |  |  | 1,810 |
Total revenue from contracts with customers | $ | 5,507 |  |  | $ | 2,135 |  |  | $ | 354 |  |  |  |  | $ | (5) |  |  | $ | 7,991 |
(a) The following amounts of energy, capacity and other revenue relate to derivative instruments and are accounted for under ASC 815: |  |  |  |  |  |  |  |  |  |  |
(In millions) | Texas |  | East |  | West/Other |  |  |  | Corporate/Eliminations |  | Total
Energy revenue | $ | 1,459 |  |  | $ | 98 |  |  | $ | 39 |  |  |  |  | $ | (1) |  |  | $ | 1,595 |
Capacity revenue | — |  |  | 109 |  |  | — |  |  |  |  | — |  |  | 109 |
Other revenue | 56 |  |  | 5 |  |  | 12 |  |  |  |  | — |  |  | 73 |
(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 |  |  |  |  |  |  |  |  |  |  |
| For the Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |
(In millions) | Texas |  | East |  | West/Other |  |  |  | Corporate/Eliminations |  | Total
Retail revenue |  |  |  |  |  |  |  |  |  |  |  |
Mass Market | $ | 4,618 |  |  | $ | 974 |  |  | $ | — |  |  |  |  | $ | (1) |  |  | $ | 5,591 |
Business Solutions | 1,238 |  |  | 65 |  |  | — |  |  |  |  | — |  |  | 1,303 |
Total retail revenue | 5,856 |  |  | 1,039 |  |  | — |  |  |  |  | (1) |  |  | 6,894 |
Energy revenue(a) | 371 |  |  | 546 |  |  | 566 |  |  |  |  | 13 |  |  | 1,496 |
Capacity revenue(a) | — |  |  | 746 |  |  | 79 |  |  |  |  | — |  |  | 825 |
Mark-to-market for economic hedging activities(b) | (77) |  |  | (35) |  |  | (5) |  |  |  |  | (13) |  |  | (130) |
Other revenue(a)(c) | 251 |  |  | 75 |  |  | 84 |  |  |  |  | (17) |  |  | 393 |
Total operating revenue | 6,401 |  |  | 2,371 |  |  | 724 |  |  |  |  | (18) |  |  | 9,478 |
Less: Lease revenue | 1 |  |  | 1 |  |  | 19 |  |  |  |  | — |  |  | 21 |
Less: Realized and unrealized ASC 815 revenue | 1,096 |  |  | 210 |  |  | 2 |  |  |  |  | 1 |  |  | 1,309 |
Total revenue from contracts with customers | $ | 5,304 |  |  | $ | 2,160 |  |  | $ | 703 |  |  |  |  | $ | (19) |  |  | 8,148 |
(a) The following amounts of energy, capacity and other revenue relate to derivative instruments and are accounted for under ASC 815: |  |  |  |  |  |  |  |  |  |  |
(In millions) | Texas |  | East |  | West/Other |  |  |  | Corporate/Eliminations |  | Total
Energy revenue | $ | 1,131 |  |  | $ | 90 |  |  | $ | (2) |  |  |  |  | $ | 14 |  |  | $ | 1,233 |
Capacity revenue | — |  |  | 137 |  |  | — |  |  |  |  | — |  |  | 137 |
Other revenue | 42 |  |  | 17 |  |  | 9 |  |  |  |  | 1 |  |  | 69 |
(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
Contract assets and liabilities | The following table reflects the contract assets and liabilities included in the Company's balance sheet as of December 31, 2019 and 2018:
(In millions) |  | December 31, 2019 |  | December 31, 2018
Deferred customer acquisition costs |  | $ | 133 |  |  | $ | 111 |
Accounts receivable, net - Contracts with customers |  | 1,002 |  |  | 999 |
Accounts receivable, net - Derivative instruments |  | 18 |  |  | 20 |
Accounts receivable, net - Affiliate |  | 5 |  |  | 5 |
Total accounts receivable, net |  | $ | 1,025 |  |  | $ | 1,024 |
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) |  | $ | 402 |  |  | $ | 392 |
Deferred revenues (a) |  | $ | 82 |  |  | $ | 67 |
(a) Deferred revenues from contracts with customers for the years ended December 31, 2019 and 2018 were approximately $24 million and $19 million, respectively.

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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