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Goodwill and Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2019
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:
(In millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2019 | Emission Allowances |  | Fuel Contracts |  |  |  | Customer Relationships |  | Marketing Partnerships |  | Trade Names |  | Other |  | Total
January 1, 2019 | $ | 659 |  |  | $ | 49 |  |  |  |  | $ | 478 |  |  | $ | 131 |  |  | $ | 345 |  |  | $ | 80 |  |  | $ | 1,742 |
Purchases | 13 |  |  | — |  |  |  |  | — |  |  | — |  |  | — |  |  | 29 |  |  | 42 |
Acquisition of businesses (a) | — |  |  | — |  |  |  |  | 110 |  |  | 154 |  |  | 28 |  |  | 26 |  |  | 318 |
Usage | (4) |  |  | — |  |  |  |  | — |  |  | — |  |  | — |  |  | (17) |  |  | (21) |
Write-off of fully amortized balances | (8) |  |  | — |  |  |  |  | (13) |  |  | — |  |  | — |  |  | (9) |  |  | (30) |
Impairment | — |  |  | — |  |  |  |  | (2) |  |  | — |  |  | — |  |  | — |  |  | (2) |
Other | 2 |  |  | — |  |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2 |
December 31, 2019 | 662 |  |  | 49 |  |  |  |  | 573 |  |  | 285 |  |  | 373 |  |  | 109 |  |  | 2,051 |
Less accumulated amortization | (539) |  |  | (45) |  |  |  |  | (345) |  |  | (75) |  |  | (220) |  |  | (38) |  |  | (1,262) |
Net carrying amount | $ | 123 |  |  | $ | 4 |  |  |  |  | $ | 228 |  |  | $ | 210 |  |  | $ | 153 |  |  | $ | 71 |  |  | $ | 789 |
(a)The weighted average life of acquired intangibles was: customer relationships 7 years, marketing partnerships 9 years, trade names 12 years, and energy supply contracts 2 years
(In millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2018 | Emission Allowances |  | Fuel Contracts |  |  |  | Customer Relationships |  | Marketing Partnerships |  | Trade Names |  | Other |  | Total
January 1, 2018 | $ | 755 |  |  | $ | 49 |  |  |  |  | $ | 768 |  |  | $ | 88 |  |  | $ | 342 |  |  | $ | 78 |  |  | $ | 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 |  |  |  |  | 478 |  |  | 131 |  |  | 345 |  |  | 80 |  |  | 1,742 |
Less accumulated amortization | (515) |  |  | (45) |  |  |  |  | (314) |  |  | (61) |  |  | (195) |  |  | (21) |  |  | (1,151) |
Net carrying amount | $ | 144 |  |  | $ | 4 |  |  |  |  | $ | 164 |  |  | $ | 70 |  |  | $ | 150 |  |  | $ | 59 |  |  | $ | 591 |
(a)The weighted average life of acquired intangibles was: customer relationships 6 years, trade names 7 years, and marketing partnerships 14 years
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, |  |  |  |
(In millions) | 2019 |  | 2018 |  | 2017
Emission allowances | $ | 32 |  |  | $ | 39 |  |  | $ | 71 |
Customer relationships | 44 |  |  | 32 |  |  | 34 |
Marketing partnerships | 15 |  |  | 9 |  |  | 5 |
Trade names | 25 |  |  | 23 |  |  | 23 |
Other | 35 |  |  | 30 |  |  | 33 |
Total amortization | $ | 151 |  |  | $ | 133 |  |  | $ | 166 |
Schedule of Estimated Amortization of Intangible Assets for Next Five Years | The following table presents estimated amortization of NRG's intangible assets as of December 31, 2019 for each of the next five years:
(In millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended December 31, | Emission Allowances |  |  |  | Fuel Contracts |  | Customer Relationships |  | Marketing Partnerships |  | Trade Names |  | Other |  | Total
2020 | $ | 36 |  |  |  |  | $ | 1 |  |  | $ | 68 |  |  | $ | 24 |  |  | $ | 27 |  |  | $ | 33 |  |  | $ | 189 |
2021 | 35 |  |  |  |  | — |  |  | 52 |  |  | 24 |  |  | 27 |  |  | 3 |  |  | 141 |
2022 | 38 |  |  |  |  | — |  |  | 36 |  |  | 23 |  |  | 27 |  |  | 3 |  |  | 127 |
2023 | 40 |  |  |  |  | 1 |  |  | 35 |  |  | 23 |  |  | 26 |  |  | 3 |  |  | 128 |
2024 | 35 |  |  |  |  | — |  |  | 15 |  |  | 23 |  |  | 17 |  |  | 3 |  |  | 93 |

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