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Wireless Licenses, Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Carrying Amount of Wireless Licenses | The carrying amounts of our Wireless licenses are as follows:
| At March 31, | At December 31,
(dollars in millions) | 2024 | 2023
Wireless licenses | $ | 156,111 |  | $ | 155,667 |
Changes in Carrying Amount of Goodwill | Changes in the carrying amount of Goodwill are as follows:
(dollars in millions) | Consumer |  | Business |  |  |  | Total
Balance at January 1, 2024(1) | $ | 21,177 |  |  | $ | 1,666 |  |  |  |  | $ | 22,843 |
Reclassifications, adjustments and other | — |  |  | (1) |  |  |  |  | (1) |
Balance at March 31, 2024 | $ | 21,177 |  |  | $ | 1,665 |  |  |  |  | $ | 22,842 |
(1) Goodwill is net of accumulated impairment charges of $5.8 billion related to our Business reporting unit.
Composition of Other Intangible Assets, Net | The following table displays the composition of Other intangible assets, net as well as the respective amortization periods:
| At March 31, 2024 |  | At December 31, 2023
(dollars in millions) | Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Customer lists (5 to 13 years) | $ | 4,335 |  |  | $ | (2,387) |  |  | $ | 1,948 |  |  | $ | 4,335 |  |  | $ | (2,193) |  |  | $ | 2,142 |
Non-network internal-use software (7 years) | 25,950 |  |  | (18,387) |  |  | 7,563 |  |  | 25,524 |  |  | (17,949) |  |  | 7,575 |
Other (4 to 25 years) | 2,656 |  |  | (1,332) |  |  | 1,324 |  |  | 2,656 |  |  | (1,316) |  |  | 1,340 |
Total | $ | 32,941 |  |  | $ | (22,106) |  |  | $ | 10,835 |  |  | $ | 32,515 |  |  | $ | (21,458) |  |  | $ | 11,057 |
Amortization Expense for Other Intangible Assets | The amortization expense for Other intangible assets was as follows:
|  |  | Three Months Ended
(dollars in millions) |  |  | March 31,
2024 |  |  | $ | 698 |
2023 |  |  | 647 |
Estimated Future Amortization Expense for Other Intangible Assets | The estimated future amortization expense for Other intangible assets for the remainder of the current year and next 5 years is as follows:
Years | (dollars in millions)
Remainder of 2024 | $ | 1,997 |
2025 | 2,430 |
2026 | 2,187 |
2027 | 1,628 |
2028 | 1,220 |
2029 | 595 |

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