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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2018
Accounting Policies [Abstract] |
Other Balance Sheet Information | The following table presents the allowance for doubtful accounts included in accounts receivable, net; accumulated depreciation included in property, plant and equipment, net; accumulated amortization included in intangible assets, net and accumulated amortization included in out-of-market contracts, net:
| March 31, 2018 |  | December 31, 2017
| (In millions)
Accounts receivable allowance for doubtful accounts | $ | 27 |  |  | $ | 28 |
Property, plant and equipment accumulated depreciation | 4,679 |  |  | 4,465 |
Intangible assets accumulated amortization | 1,393 |  |  | 1,818 |
Out-of-market contracts accumulated amortization | 364 |  |  | 358 |
Reconciliation of Cash and Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties | The following table provides a reconciliation of cash and cash equivalents, restricted cash and funds deposited by counterparties reported within the consolidated balance sheet that sum to the total of the same such amounts shown in the statement of cash flows.
| March 31, 2018 |  | December 31, 2017 |  | March 31, 2017 |  | December 31, 2016
| (In millions)
Cash and cash equivalents | $ | 764 |  |  | $ | 991 |  |  | $ | 627 |  |  | $ | 938 |
Funds deposited by counterparties | 241 |  |  | 37 |  |  | 3 |  |  | 2 |
Restricted cash | 407 |  |  | 508 |  |  | 397 |  |  | 446 |
Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows | $ | 1,412 |  |  | $ | 1,536 |  |  | $ | 1,027 |  |  | $ | 1,386 |
Schedule of Change in Noncontrolling Interest | Noncontrolling Interest The following table reflects the changes in NRG's noncontrolling interest balance:
| (In millions)
Balance as of December 31, 2017 | $ | 2,314 |
Dividends paid to NRG Yield, Inc. public shareholders | (30 | )
Distributions to noncontrolling interest | (19 | )
Comprehensive loss attributable to noncontrolling interest | (22 | )
Non-cash adjustments to noncontrolling interest | 6 |
Contributions from noncontrolling interest | 147 |
Sale of assets to NRG Yield, Inc. | (4 | )
Balance as of March 31, 2018 | $ | 2,392 |
Redeemable Noncontrolling Interest | Redeemable Noncontrolling Interest The following table reflects the changes in the Company's redeemable noncontrolling interest balance:
| (In millions)
Balance as of December 31, 2017 | $ | 78 |
Distributions to redeemable noncontrolling interest | (1 | )
Contributions from redeemable noncontrolling interest | 12 |
Non-cash adjustments to redeemable noncontrolling interest | 7 |
Comprehensive loss attributable to redeemable noncontrolling interest | (16 | )
Balance as of March 31, 2018 | $ | 80 |
Disaggregation of Revenue from Contracts | The following table represents the Company’s disaggregation of revenue from contracts with customers for the three months ended March 31, 2018, along with the reportable segment for each category:
| Three months ended March 31, 2018
|  |  | Generation |  |  |  |  |  |  |  |
(In millions) | Retail |  | Gulf Coast |  | East/West(a) |  | Subtotal |  | Renewables |  | NRG Yield |  | Eliminations |  | Total
Energy revenue(a)(b) | $ | — |  |  | $ | 371 |  |  | $ | 218 |  |  | $ | 589 |  |  | $ | 77 |  |  | $ | 114 |  |  | $ | (161 | ) |  | $ | 619 |
Capacity revenue(a)(b) | — |  |  | 67 |  |  | 140 |  |  | 207 |  |  | — |  |  | 82 |  |  | (1 | ) |  | 288 |
Retail revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mass customers | 1,171 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | 1,170 |
Business solutions customers | 316 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 316 |
Total retail revenue | 1,487 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | 1,486 |
Mark-to-market for economic hedging activities(c) | (6 | ) |  | (564 | ) |  | (10 | ) |  | (574 | ) |  | (10 | ) |  | — |  |  | 484 |  |  | (106 | )
Contract amortization | — |  |  | 3 |  |  | — |  |  | 3 |  |  | — |  |  | (17 | ) |  | — |  |  | (14 | )
Other revenue(a)(b) | — |  |  | 86 |  |  | 16 |  |  | 102 |  |  | 19 |  |  | 46 |  |  | (19 | ) |  | 148 |
Total operating revenue | 1,481 |  |  | (37 | ) |  | 364 |  |  | 327 |  |  | 86 |  |  | 225 |  |  | 302 |  |  | 2,421 |
Less: Lease revenue | 6 |  |  | — |  |  | 1 |  |  | 1 |  |  | 64 |  |  | 181 |  |  | — |  |  | 252 |
Less: Derivative revenue | (6 | ) |  | (188 | ) |  | 80 |  |  | (108 | ) |  | (10 | ) |  | — |  |  | 484 |  |  | 360 |
Less: Contract amortization | — |  |  | 3 |  |  | — |  |  | 3 |  |  | — |  |  | (17 | ) |  | — |  |  | (14 | )
Total revenue from contracts with customers | $ | 1,481 |  |  | $ | 148 |  |  | $ | 283 |  |  | $ | 431 |  |  | $ | 32 |  |  | $ | 61 |  |  | $ | (182 | ) |  | $ | 1,823 |
(a) The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 840:
| Retail |  | Gulf Coast |  | East/West |  | Subtotal |  | Renewables |  | NRG Yield |  | Eliminations |  | Total
Energy revenue | — |  |  | — |  |  | — |  |  | — |  |  | 61 |  |  | 102 |  |  | — |  |  | 163 |
Capacity revenue | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 79 |  |  | — |  |  | 79 |
Other revenue | 6 |  |  | — |  |  | 1 |  |  | 1 |  |  | 3 |  |  | — |  |  | — |  |  | 10 |
(b) The following amounts of energy and capacity revenue relate to derivative instruments and are accounted for under ASC 815.
| Retail |  | Gulf Coast |  | East/West |  | Subtotal |  | Renewables |  | NRG Yield |  | Eliminations |  | Total
Energy revenue | — |  |  | 371 |  |  | 61 |  |  | 432 |  |  | — |  |  | — |  |  | — |  |  | 432 |
Capacity revenue | — |  |  | — |  |  | 26 |  |  | 26 |  |  | — |  |  | — |  |  | — |  |  | 26 |
Other revenue | — |  |  | 5 |  |  | 3 |  |  | 8 |  |  | — |  |  | — |  |  | — |  |  | 8 |
(c) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815.
Contract with Customer, Asset and Liability | The following table reflects the contract assets and liabilities included in the Company’s balance sheet as of March 31, 2018:
(In millions) |  | March 31, 2018
Deferred customer acquisition costs |  | $ | 85 |
Accounts receivable, net - Contracts with customers |  | 784 |
Accounts receivable, net - Leases |  | 81 |
Accounts receivable, net - Derivative instruments |  | 38 |
Total accounts receivable, net |  | 903 |
Unbilled revenues (included within Accounts receivable, net - Contracts with customers) |  | 292 |
Deferred revenues |  | 63 |

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