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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020, 2019 and 2018:
| For the Year Ended December 31, 2020
(In millions) | Texas |  | East |  | West/Other |  |  |  | Corporate/Eliminations |  | Total
Retail revenue |  |  |  |  |  |  |  |  |  |  |
Mass Market | $ | 5,027 |  |  | $ | 1,306 |  |  | $ | — |  |  |  |  | $ | (2) |  |  | $ | 6,331 |
Business Solutions | 1,034 |  |  | 95 |  |  | — |  |  |  |  | — |  |  | 1,129 |
Total retail revenue | 6,061 |  |  | 1,401 |  |  | — |  |  |  |  | (2) |  |  | 7,460 |
Energy revenue(a) | 24 |  |  | 183 |  |  | 333 |  |  |  |  | (1) |  |  | 539 |
Capacity revenue(a) | — |  |  | 620 |  |  | 61 |  |  |  |  | (1) |  |  | 680 |
Mark-to-market for economic hedging activities(b) | 2 |  |  | 88 |  |  | (3) |  |  |  |  | 8 |  |  | 95 |
Other revenue(a) | 222 |  |  | 62 |  |  | 43 |  |  |  |  | (8) |  |  | 319 |
Total operating revenue | 6,309 |  |  | 2,354 |  |  | 434 |  |  |  |  | (4) |  |  | 9,093 |
Less: Lease revenue | — |  |  | 1 |  |  | 17 |  |  |  |  | — |  |  | 18 |
Less: Realized and unrealized ASC 815 revenue | 30 |  |  | 314 |  |  | 38 |  |  |  |  | 3 |  |  | 385 |
Total revenue from contracts with customers | $ | 6,279 |  |  | $ | 2,039 |  |  | $ | 379 |  |  |  |  | $ | (7) |  |  | $ | 8,690 |
(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 | $ | — |  |  | $ | 67 |  |  | $ | 43 |  |  |  |  | $ | (5) |  |  | $ | 105 |
Capacity revenue | — |  |  | 156 |  |  | — |  |  |  |  | — |  |  | 156 |
Other revenue | 28 |  |  | 3 |  |  | (2) |  |  |  |  | — |  |  | 29 |
(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
| 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)(c) | 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, 2020 and 2019:
(In millions) |  | December 31, 2020 |  | December 31, 2019
Deferred customer acquisition costs |  | $ | 113 |  |  | $ | 133 |
Accounts receivable, net - Contracts with customers |  | 866 |  |  | 1,002 |
Accounts receivable, net - Derivative instruments |  | 33 |  |  | 18 |
Accounts receivable, net - Affiliate |  | 5 |  |  | 5 |
Total accounts receivable, net |  | $ | 904 |  |  | $ | 1,025 |
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) |  | $ | 393 |  |  | $ | 402 |
Deferred revenues (a) |  | $ | 60 |  |  | $ | 82 |
(a) Deferred revenues from contracts with customers for the years ended December 31, 2020 and 2019 were approximately $31 million and $24 million, respectively.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + 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=121604090&loc=SL49130551-203045 + Details
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