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Goodwill and Other Intangible Assets | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets The changes in the net carrying amount of goodwill for the nine months ended September 30, 2020 are as follows (in millions):
Balance as of December 31, 2019 | $ | 8,165 |
Goodwill related to current year acquisitions | 315 |
Goodwill related to disposals | (3) |
Foreign currency translation | (15) |
Balance as of September 30, 2020 | $ | 8,462 |
Other intangible assets by asset class are as follows (in millions):
| September 30, 2020 |  | December 31, 2019
| Gross Carrying Amount |  | Accumulated Amortization and Impairment |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization and Impairment |  | Net Carrying Amount
Customer-related and contract-based | $ | 2,273 |  |  | $ | 1,690 |  |  | $ | 583 |  |  | $ | 2,264 |  |  | $ | 1,600 |  |  | $ | 664 |
Tradenames (1) | 14 |  |  | 12 |  |  | 2 |  |  | 1,029 |  |  | 956 |  |  | 73 |
Technology and other | 421 |  |  | 341 |  |  | 80 |  |  | 380 |  |  | 334 |  |  | 46 |
Total | $ | 2,708 |  |  | $ | 2,043 |  |  | $ | 665 |  |  | $ | 3,673 |  |  | $ | 2,890 |  |  | $ | 783 |
(1)In 2020, Aon wrote off $1.0 billion of fully amortized tradenames, including the Hewitt and Benfield tradenames. The company no longer expects to receive economic benefits from these tradenames. The estimated future amortization for finite-lived intangible assets as of September 30, 2020 is as follows (in millions):
Remainder of 2020 | $ | 40 |
2021 | 140 |
2022 | 100 |
2023 | 88 |
2024 | 71 |
2025 | 52 |
Thereafter | 174 |
Total | $ | 665 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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