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Goodwill and Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of the Components of Intangible Assets Subject to Amortization | The following tables summarize the components of NRG's intangible assets subject to amortization:
|  |  | Contracts |  |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2017 | Emission Allowances |  | Energy Supply |  | Fuel |  | Customer |  | Customer Relationships |  | Marketing Partnerships |  | Trade Names |  | PPA |  | Other |  | Total
| (In millions)
January 1, 2017 | $ | 789 |  |  | $ | 54 |  |  | $ | 72 |  |  | $ | 16 |  |  | $ | 816 |  |  | $ | 88 |  |  | $ | 342 |  |  | $ | 1,286 |  |  | $ | 198 |  |  | $ | 3,661 |
Purchases | 31 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 32 |  |  | 63 |
Acquisition of businesses | — |  |  | — |  |  | — |  |  | — |  |  | 18 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 18 |
Usage | (10 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (28 | ) |  | (38 | )
Write-off of fully amortized balances(a) | — |  |  | (54 | ) |  | (23 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (77 | )
Impairment | (20 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (6 | ) |  | — |  |  | (26 | )
Other | (23 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 5 |  |  | (19 | ) |  | (37 | )
December 31, 2017 | 767 |  |  | — |  |  | 49 |  |  | 16 |  |  | 834 |  |  | 88 |  |  | 342 |  |  | 1,285 |  |  | 183 |  |  | 3,564 |
Less accumulated amortization | (591 | ) |  | — |  |  | (45 | ) |  | (9 | ) |  | (698 | ) |  | (54 | ) |  | (182 | ) |  | (205 | ) |  | (34 | ) |  | (1,818 | )
Net carrying amount | $ | 176 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 7 |  |  | $ | 136 |  |  | $ | 34 |  |  | $ | 160 |  |  | $ | 1,080 |  |  | $ | 149 |  |  | $ | 1,746 |
(a) Adjusted for write-off of fully amortized energy supply contracts of $54 million and fuel contracts of $23 million.
|  |  | Contracts |  |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2016 | Emission Allowances |  | Energy Supply |  | Fuel |  | Customer |  | Customer Relationships |  | Marketing Partnerships |  | Trade Names |  | PPA |  | Other |  | Total
| (In millions)
January 1, 2016 | $ | 816 |  |  | $ | 54 |  |  | $ | 72 |  |  | $ | 16 |  |  | $ | 834 |  |  | $ | 88 |  |  | $ | 342 |  |  | $ | 1,286 |  |  | $ | 213 |  |  | $ | 3,721 |
Purchases | 13 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 34 |  |  | 47 |
Acquisition of businesses | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  | 18 |  |  | 18 |
Usage | (1 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (44 | ) |  | (45 | )
Write-off of fully amortized balances(a) | (10 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (10 | )
Impairment(b) | (23 | ) |  | — |  |  | — |  |  | — |  |  | (18 | ) |  | — |  |  | — |  |  | — |  |  | (23 | ) |  | (64 | )
Other | (6 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (6 | )
December 31, 2016 | 789 |  |  | 54 |  |  | 72 |  |  | 16 |  |  | 816 |  |  | 88 |  |  | 342 |  |  | 1,286 |  |  | 198 |  |  | 3,661 |
Less accumulated amortization | (518 | ) |  | (54 | ) |  | (67 | ) |  | (8 | ) |  | (663 | ) |  | (49 | ) |  | (159 | ) |  | (143 | ) |  | (27 | ) |  | (1,688 | )
Net carrying amount | $ | 271 |  |  | $ | — |  |  | $ | 5 |  |  | $ | 8 |  |  | $ | 153 |  |  | $ | 39 |  |  | $ | 183 |  |  | $ | 1,143 |  |  | $ | 171 |  |  | $ | 1,973 |
(a) Adjusted for write-off of fully amortized emission allowances of $10 million. (b) The impairment of customer relationships and other intangibles included a write-off of accumulated amortization of $10 million and $8 million, respectively.
Schedule of Amortization of Intangible Expense | The following table presents NRG's amortization of intangible assets for each of the past three years:
| Years Ended December 31,
Amortization | 2017 |  | 2016 |  | 2015
| (In millions)
Emission allowances | $ | 73 |  |  | $ | 66 |  |  | $ | 60 |
Energy supply contracts | — |  |  | 7 |  |  | 5 |
Fuel contracts | 1 |  |  | 2 |  |  | 2 |
Customer contracts | 1 |  |  | 2 |  |  | 2 |
Customer relationships | 35 |  |  | 49 |  |  | 67 |
Marketing partnerships | 5 |  |  | 8 |  |  | 14 |
Trade names | 23 |  |  | 22 |  |  | 23 |
Power purchase agreements | 62 |  |  | 64 |  |  | 51 |
Other | 7 |  |  | 11 |  |  | 14 |
Total amortization | $ | 207 |  |  | $ | 231 |  |  | $ | 238 |
Schedule of Estimated Amortization of Intangible Assets for Next Five Years | The following table presents estimated amortization of NRG's intangible assets for each of the next five years:
|  |  | Contracts |  |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, | Emission Allowances |  | Fuel |  | Customer |  | Customer Relationships |  | Marketing Partnerships |  | Trade Names |  | PPA |  | Other |  | Total
| (In millions)
2018 | $ | 33 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 25 |  |  | $ | 5 |  |  | $ | 22 |  |  | $ | 64 |  |  | $ | 8 |  |  | $ | 159 |
2019 | 30 |  |  | — |  |  | 1 |  |  | 21 |  |  | 4 |  |  | 22 |  |  | 64 |  |  | 8 |  |  | 150 |
2020 | 16 |  |  | — |  |  | 1 |  |  | 17 |  |  | 4 |  |  | 22 |  |  | 64 |  |  | 8 |  |  | 132 |
2021 | 16 |  |  | — |  |  | 1 |  |  | 13 |  |  | 4 |  |  | 22 |  |  | 64 |  |  | 8 |  |  | 128 |
2022 | 15 |  |  | — |  |  | 1 |  |  | 7 |  |  | 3 |  |  | 22 |  |  | 64 |  |  | 8 |  |  | 120 |
Schedule of Out of Market Contracts, Future Amortization | The following table summarizes the estimated amortization related to NRG's out-of-market contracts:
Year Ended December 31, | Power Contracts |  | Leases |  | Total
| (In millions
2018 | $ | 16 |  |  | $ | 9 |  |  | $ | 25 |
2019 | 16 |  |  | 9 |  |  | 25 |
2020 | 17 |  |  | 9 |  |  | 26 |
2021 | 14 |  |  | 9 |  |  | 23 |
2022 | 1 |  |  | 9 |  |  | 10 |

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