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Goodwill and Other Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of goodwill | Changes in the carrying amount of goodwill are as follows:
(In millions of dollars) | 2020 |  | 2019
Balance as of January 1, as reported | $ | 14,671 |  |  | $ | 9,599 |
Goodwill acquired (a) | 593 |  |  | 5,124 |
Other adjustments (b) | 253 |  |  | (52) |
Balance at December 31, | $ | 15,517 |  |  | $ | 14,671 |
(a) Includes $4.9 billion from the acquisition of JLT in 2019. (b) Primarily reflects the impact of foreign exchange and dispositions.
Schedule of finite-lived intangible assets | The gross cost and accumulated amortization of intangible assets at December 31, 2020 and 2019 are as follows:
(In millions of dollars) | 2020 |  | 2019
| Gross Cost |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Cost |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 3,713 |  |  | $ | 1,170 |  |  | $ | 2,543 |  |  | $ | 3,494 |  |  | $ | 897 |  |  | $ | 2,597 |
Other (a) | 386 |  |  | 230 |  |  | 156 |  |  | 380 |  |  | 203 |  |  | 177 |
Amortized intangibles | $ | 4,099 |  |  | $ | 1,400 |  |  | $ | 2,699 |  |  | $ | 3,874 |  |  | $ | 1,100 |  |  | $ | 2,774 |
(a) Primarily non-compete agreements, trade names and developed technology.
Estimated future aggregate amortization expense | The estimated future aggregate amortization expense is as follows:
For the Years Ending December 31, |
(In millions of dollars) |
2021 | $ | 356 |
2022 | 327 |
2023 | 300 |
2024 | 285 |
2025 | 275 |
Subsequent years | 1,156 |
| $ | 2,699 |

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