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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 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 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 |
Schedule of Other Intangible Assets by Asset Class | Amortization basis and estimated useful lives by intangible asset type are generally as follows:
Intangible Asset Description |  | Amortization Basis |  | Estimated Useful Life
Tradenames |  | Straight-line |  | 1 to 3 years
Customer-related and contract-based |  | In line with underlying cash flows |  | 7 to 20 years
Technology and other |  | Straight-line |  | 5 to 7 years
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.
Schedule of Estimated Future Amortization Expense on Intangible Assets | 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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