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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2024
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, 2024 and 2023, respectively, are as follows (in millions):
| Risk Capital | Human Capital | Total
Balance as of January 1, 2023 | $ | 6,127 |  | $ | 2,165 |  | $ | 8,292 |
Goodwill related to current year acquisitions | 20 |  | 3 |  | 23 |
Goodwill related to current year disposals | (1) |  | — |  | (1) |
Foreign currency translation and other | 81 |  | 19 |  | 100 |
Balance as of December 31, 2023 | $ | 6,227 |  | $ | 2,187 |  | $ | 8,414 |
Goodwill related to current year acquisitions | 2,768 |  | 4,357 |  | 7,125 |
Goodwill related to current year disposals | (50) |  | (32) |  | (82) |
Foreign currency translation and other | (160) |  | (63) |  | (223) |
Balance as of December 31, 2024 | $ | 8,785 |  | $ | 6,449 |  | $ | 15,234 |
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
Customer-related and contract-based |  | In line with underlying cash flows |  | 7 to 23 years
Tradenames |  | Straight-line |  | 1 to 10.5 years
Technology and other intangibles |  | Straight-line |  | 5 to 7 years
Other intangible assets by asset class are as follows (in millions):
| 2024 |  | 2023
As of December 31 | 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 | $ | 7,994 |  |  | $ | 2,050 |  |  | $ | 5,944 |  |  | $ | 1,873 |  |  | $ | 1,686 |  |  | $ | 187 |
Tradenames | 812 |  |  | 66 |  |  | 746 |  |  | 12 |  |  | 12 |  |  | — |
Technology and other | 366 |  |  | 313 |  |  | 53 |  |  | 359 |  |  | 312 |  |  | 47 |
Total | $ | 9,172 |  |  | $ | 2,429 |  |  | $ | 6,743 |  |  | $ | 2,244 |  |  | $ | 2,010 |  |  | $ | 234 |
Schedule of Estimated Future Amortization Expense on Intangible Assets | The estimated future amortization for finite-lived intangible assets as of December 31, 2024 is as follows (in millions):
|  | Estimated Future Amortization
For the years ended |
2025 |  | $ | 760 |
2026 |  | 691 |
2027 |  | 633 |
2028 |  | 582 |
2029 |  | 538 |
Thereafter |  | 3,539 |
Total |  | $ | 6,743 |

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