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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 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 years ended December 31, 2020 and 2019, respectively, are as follows (in millions):
Balance as of January 1, 2019 | $ | 8,171 |
Goodwill related to current year acquisitions | 34 |
Goodwill related to disposals | (11) |
Goodwill related to prior year acquisitions | 2 |
Foreign currency translation | (31) |
Balance as of December 31, 2019 | $ | 8,165 |
Goodwill related to current year acquisitions | 314 |
Goodwill related to disposals | (3) |
Foreign currency translation | 190 |
Balance as of December 31, 2020 | $ | 8,666 |
Other intangible assets by asset class are as follows (in millions):
| As of December 31
| 2020 |  | 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 | $ | 2,337 |  |  | $ | 1,775 |  |  | $ | 562 |  |  | $ | 2,264 |  |  | $ | 1,600 |  |  | $ | 664 |
Tradenames (1) | 14 |  |  | 13 |  |  | 1 |  |  | 1,029 |  |  | 956 |  |  | 73 |
Technology and other | 435 |  |  | 358 |  |  | 77 |  |  | 380 |  |  | 334 |  |  | 46 |
Total | $ | 2,786 |  |  | $ | 2,146 |  |  | $ | 640 |  |  | $ | 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. Amortization expense and impairment charges from finite lived intangible assets were $246 million, $392 million, and $593 million for the years ended December 31, 2020, 2019, and 2018, respectively. The estimated future amortization for finite-lived intangible assets as of December 31, 2020 is as follows (in millions):
|  | Estimated Future Amortization
For the years ended |
2021 |  | $ | 144 |
2022 |  | 102 |
2023 |  | 91 |
2024 |  | 73 |
2025 |  | 59 |
Thereafter |  | 171 |
Total |  | $ | 640 |

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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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