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Goodwill and Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 | Emission Allowances |  | Fuel |  | Customer Contracts |  | Customer Relationships |  | Marketing Partnerships |  | Trade Names |  | Other |  | Total
January 1, 2018 | $ | 755 |  |  | $ | 49 |  |  | $ | 1 |  |  | $ | 768 |  |  | $ | 88 |  |  | $ | 342 |  |  | $ | 77 |  |  | $ | 2,080 |
Purchases | 33 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 28 |  |  | 61 |
Acquisition of businesses(a) | — |  |  | — |  |  | — |  |  | 122 |  |  | 43 |  |  | 13 |  |  | — |  |  | 178 |
Usage | (1 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (26 | ) |  | (27 | )
Write-off of fully amortized balances | (107 | ) |  | — |  |  | — |  |  | (411 | ) |  | — |  |  | (10 | ) |  | — |  |  | (528 | )
Impairment | (5 | ) |  | — |  |  | — |  |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | (6 | )
Other | (16 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (16 | )
December 31, 2018 | 659 |  |  | 49 |  |  | 1 |  |  | 478 |  |  | 131 |  |  | 345 |  |  | 79 |  |  | 1,742 |
Less accumulated amortization | (515 | ) |  | (45 | ) |  | (1 | ) |  | (314 | ) |  | (61 | ) |  | (195 | ) |  | (20 | ) |  | (1,151 | )
Net carrying amount | $ | 144 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 164 |  |  | $ | 70 |  |  | $ | 150 |  |  | $ | 59 |  |  | $ | 591 |
(a) T
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 | 2018 |  | 2017 |  | 2016
| (In millions)
Emission allowances | $ | 39 |  |  | $ | 71 |  |  | $ | 62 |
Energy supply contracts | — |  |  | 1 |  |  | 6 |
Fuel contracts | — |  |  | 1 |  |  | 1 |
Customer relationships | 32 |  |  | 34 |  |  | 48 |
Marketing partnerships | 9 |  |  | 5 |  |  | 8 |
Trade names | 23 |  |  | 23 |  |  | 23 |
Other | 4 |  |  | 3 |  |  | 9 |
Total amortization | $ | 107 |  |  | $ | 138 |  |  | $ | 157 |
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:
Year Ended December 31, | Emission Allowances |  | Fuel Contracts |  | Customer Relationships |  | Marketing Partnerships |  | Trade Names |  | Other |  | Total
| (In millions)
2019 | $ | 48 |  |  | $ | — |  |  | $ | 38 |  |  | $ | 11 |  |  | $ | 24 |  |  | $ | 3 |  |  | $ | 124 |
2020 | 37 |  |  | 1 |  |  | 39 |  |  | 11 |  |  | 25 |  |  | 3 |  |  | 116 |
2021 | 43 |  |  | — |  |  | 33 |  |  | 10 |  |  | 24 |  |  | 3 |  |  | 113 |
2022 | 50 |  |  | — |  |  | 23 |  |  | 10 |  |  | 24 |  |  | 3 |  |  | 110 |
2023 | 49 |  |  | 1 |  |  | 26 |  |  | 10 |  |  | 24 |  |  | 3 |  |  | 113 |
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, | Leases
2019 | $ | 8 |
2020 | 8 |
2021 | 8 |
2022 | 8 |
2023 | 8 |

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