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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 |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Generation |  |  |  |  |  |  |  |  |  |
(In millions) | Retail |  | Texas |  | East/West/Other |  |  |  | Subtotal |  | Corporate/Eliminations |  | Total
Energy revenue(a) | $ | — |  |  | $ | 1,987 |  |  | $ | 733 |  |  |  |  | $ | 2,720 |  |  | $ | (1,498) |  |  | $ | 1,222 |
Capacity revenue(a) | — |  |  | — |  |  | 606 |  |  |  |  | 606 |  |  | 1 |  |  | 607 |
Retail revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Mass market | 6,277 |  |  | — |  |  | — |  |  |  |  | — |  |  | (4) |  |  | 6,273 |
Business Solutions | 1,403 |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | 1,403 |
Total retail revenue | 7,680 |  |  | — |  |  | — |  |  |  |  | — |  |  | (4) |  |  | 7,676 |
Mark-to-market for economic hedging activities(b) | — |  |  | 198 |  |  | 36 |  |  |  |  | 234 |  |  | (201) |  |  | 33 |
Other revenue(a) | — |  |  | 90 |  |  | 197 |  |  |  |  | 287 |  |  | (4) |  |  | 283 |
Total operating revenue | 7,680 |  |  | 2,275 |  |  | 1,572 |  |  |  |  | 3,847 |  |  | (1,706) |  |  | 9,821 |
Less: Lease revenue | 12 |  |  | — |  |  | 8 |  |  |  |  | 8 |  |  | — |  |  | 20 |
Less: Realized and unrealized ASC 815 revenue | — |  |  | 3,145 |  |  | 364 |  |  |  |  | 3,509 |  |  | (1,699) |  |  | 1,810 |
Total revenue from contracts with customers | $ | 7,668 |  |  | $ | (870) |  |  | $ | 1,200 |  |  |  |  | $ | 330 |  |  | $ | (7) |  |  | $ | 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) | Retail |  | Texas |  | East/West/Other |  |  |  | Subtotal |  | Corporate/Eliminations |  | Total
Energy revenue | $ | — |  |  | $ | 2,917 |  |  | $ | 231 |  |  |  |  | $ | 3,148 |  |  | $ | (1,499) |  |  | $ | 1,649 |
Capacity revenue | — |  |  | — |  |  | 107 |  |  |  |  | 107 |  |  | 1 |  |  | 108 |
Other revenue | — |  |  | 30 |  |  | (10) |  |  |  |  | 20 |  |  | (1) |  |  | 19 |
(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 |  |  |  |  |  |  |  |  |  |  |  |  |
| For the Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Generation |  |  |  |  |  |  |  |  |  |
(In millions) | Retail |  | Texas |  | East/West/Other |  |  |  | Subtotal |  | Corporate/Eliminations |  | Total
Energy revenue(a) | $ | — |  |  | $ | 1,585 |  |  | $ | 1,092 |  |  |  |  | $ | 2,677 |  |  | $ | (1,129) |  |  | $ | 1,548 |
Capacity revenue(a) | — |  |  | 1 |  |  | 669 |  |  |  |  | 670 |  |  | — |  |  | 670 |
Retail revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Mass market | 5,618 |  |  | — |  |  | — |  |  |  |  | — |  |  | (5) |  |  | 5,613 |
Business Solutions | 1,492 |  |  | — |  |  | — |  |  |  |  | — |  |  | — |  |  | 1,492 |
Total retail revenue | 7,110 |  |  | — |  |  | — |  |  |  |  | — |  |  | (5) |  |  | 7,105 |
Mark-to-market for economic hedging activities(b) | (7) |  |  | (174) |  |  | (28) |  |  |  |  | (202) |  |  | 79 |  |  | (130) |
Other revenue(a)(c) | — |  |  | 84 |  |  | 214 |  |  |  |  | 298 |  |  | (13) |  |  | 285 |
Total operating revenue | 7,103 |  |  | 1,496 |  |  | 1,947 |  |  |  |  | 3,443 |  |  | (1,068) |  |  | 9,478 |
Less: Lease revenue | 13 |  |  | — |  |  | 8 |  |  |  |  | 8 |  |  | — |  |  | 21 |
Less: Realized and unrealized ASC 815 revenue | (7) |  |  | 2,160 |  |  | 193 |  |  |  |  | 2,353 |  |  | (1,037) |  |  | 1,309 |
Total revenue from contracts with customers | $ | 7,097 |  |  | $ | (664) |  |  | $ | 1,746 |  |  |  |  | $ | 1,082 |  |  | $ | (31) |  |  | $ | 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) | Retail |  | Texas |  | East/West/Other |  |  |  | Subtotal |  | Corporate/Eliminations |  | Total
Energy revenue | $ | — |  |  | $ | 2,332 |  |  | $ | 69 |  |  |  |  | $ | 2,401 |  |  | $ | (1,117) |  |  | $ | 1,284 |
Capacity revenue | — |  |  | — |  |  | 138 |  |  |  |  | 138 |  |  | — |  |  | 138 |
Other revenue | — |  |  | 2 |  |  | 14 |  |  |  |  | 16 |  |  | — |  |  | 16 |
(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815 (c) Included in other revenue is lease revenue of $17 million and $5 million for Retail and East/West/Other, respectively
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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