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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in the Net Carrying Amount of Goodwill by Operating Segment | 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 |
Schedule of Finite-Lived Intangible Assets | 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.
Schedule of Estimated Future Amortization Expense on Intangible Assets | 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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