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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue from Contracts with Customer | Disaggregated Revenues The following table represents the Company’s disaggregation of revenue from contracts with customers for the three months ended March 31, 2019 and March 31, 2018, along with the reportable segment for each category:
| Three months ended March 31, 2019
|  |  | Generation |  |  |  |
(In millions) | Retail |  | Texas |  | East/West/Other |  | Subtotal |  | Corporate/Eliminations |  | Total
Energy revenue(a)(b) | $ | — |  |  | $ | 358 |  |  | $ | 224 |  |  | $ | 582 |  |  | $ | (276 | ) |  | $ | 306 |
Capacity revenue(a) | — |  |  | — |  |  | 155 |  |  | 155 |  |  | (1 | ) |  | 154 |
Retail revenue |  |  |  |  |  |  |  |  |  |  |
Mass customers | 1,321 |  |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | 1,320 |
Business Solutions customers | 286 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 286 |
Total retail revenue | 1,607 |  |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | 1,606 |
Mark-to-market for economic hedging activities(b)(c) | — |  |  | 13 |  |  | (8 | ) |  | 5 |  |  | 15 |  |  | 20 |
Other revenues(a) | — |  |  | 29 |  |  | 52 |  |  | 81 |  |  | (2 | ) |  | 79 |
Total operating revenue | 1,607 |  |  | 400 |  |  | 423 |  |  | 823 |  |  | (265 | ) |  | 2,165 |
Less: Lease revenue | 3 |  |  | — |  |  | 2 |  |  | 2 |  |  | — |  |  | 5 |
Less: Realized and unrealized ASC 815 revenue(b) | — |  |  | 546 |  |  | 97 |  |  | 643 |  |  | (262 | ) |  | 381 |
Total revenue from contracts with customers | $ | 1,604 |  |  | $ | (146 | ) |  | $ | 324 |  |  | $ | 178 |  |  | $ | (3 | ) |  | $ | 1,779 |
(a) The following amounts of energy and capacity revenue primarily relate to derivative instruments and are accounted for under ASC 815
| Retail |  | Texas |  | East/West/Other |  | Subtotal |  | Corporate/Eliminations |  | Total
Energy revenue | $ | — |  |  | $ | 525 |  |  | $ | 88 |  |  | $ | 613 |  |  | $ | (277 | ) |  | $ | 336 |
Capacity revenue | — |  |  | — |  |  | 18 |  |  | 18 |  |  | — |  |  | 18 |
Other revenue | — |  |  | 8 |  |  | (1 | ) |  | 7 |  |  | — |  |  | 7 |
(b) 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 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
| Three months ended March 31, 2018
|  |  | Generation |  |  |  |
(In millions) | Retail |  | Texas |  | East/West/Other |  | Subtotal |  | Corporate/Eliminations |  | Total
Energy revenue(a)(b) | $ | — |  |  | $ | 265 |  |  | $ | 339 |  |  | $ | 604 |  |  | $ | (161 | ) |  | $ | 443 |
Capacity revenue(a) | — |  |  | — |  |  | 142 |  |  | 142 |  |  | — |  |  | 142 |
Retail revenue |  |  |  |  |  |  |  |  |  |  |
Mass customers | 1,176 |  |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | 1,175 |
Business Solutions customers | 310 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 310 |
Total retail revenue | 1,486 |  |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | 1,485 |
Mark-to-market for economic hedging activities(b)(c) | (6 | ) |  | (569 | ) |  | (5 | ) |  | (574 | ) |  | 484 |  |  | (96 | )
Other revenues(a) | — |  |  | 53 |  |  | 45 |  |  | 98 |  |  | (7 | ) |  | 91 |
Total operating revenue | 1,480 |  |  | (251 | ) |  | 521 |  |  | 270 |  |  | 315 |  |  | 2,065 |
Less: Lease revenue | 3 |  |  | — |  |  | 2 |  |  | 2 |  |  | — |  |  | 5 |
Less: Realized and unrealized ASC 815 revenue(b) | (6 | ) |  | (150 | ) |  | 85 |  |  | (65 | ) |  | 327 |  |  | 256 |
Total revenue from contracts with customers | $ | 1,483 |  |  | $ | (101 | ) |  | $ | 434 |  |  | $ | 333 |  |  | $ | (12 | ) |  | $ | 1,804 |
(a) The following amounts of energy and capacity revenue relate to derivative instruments and are accounted for under ASC 815
| Retail |  | Texas |  | East/West/Other |  | Subtotal |  | Corporate/Eliminations |  | Total
Energy revenue | $ | — |  |  | $ | 413 |  |  | $ | 60 |  |  | $ | 473 |  |  | $ | (157 | ) |  | $ | 316 |
Capacity revenue | — |  |  | — |  |  | 26 |  |  | 26 |  |  | — |  |  | 26 |
Other revenue | — |  |  | 5 |  |  | 3 |  |  | 8 |  |  | — |  |  | 8 |
(b) 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 (c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
Contract Asset and Liabilities | The following table reflects the contract assets and liabilities included in the Company’s balance sheet as of March 31, 2019 and December 31, 2018:
(In millions) | March 31, 2019 |  | December 31, 2018
Deferred customer acquisition costs | $ | 117 |  |  | $ | 111 |
Accounts receivable, net - Contracts with customers | 870 |  |  | 999 |
Accounts receivable, net - Derivative instruments | 22 |  |  | 20 |
Accounts receivable, net - Affiliate | 6 |  |  | 5 |
Total accounts receivable, net | $ | 898 |  |  | $ | 1,024 |
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) | $ | 305 |  |  | $ | 392 |
Deferred revenues | 80 |  |  | 67 |

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