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Wireless Licenses, Goodwill and Other Intangible Assets | 3 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Wireless Licenses, Goodwill, and Other Intangible Assets |
Note 4. Wireless Licenses, Goodwill, and Other Intangible Assets
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 |
During the three months ended March 31, 2024 and March 31, 2023, we made payments of $269 million and $114 million, respectively, for obligations related to clearing costs and accelerated clearing incentives for wireless licenses in connection with Auction 107. See Note 3 for additional information. At March 31, 2024 and 2023, approximately $13.9 billion and $38.9 billion, respectively, of wireless licenses were under development for commercial service for which we were capitalizing interest costs. We recorded approximately $180 million and $449 million of capitalized interest on wireless licenses for the three months ended March 31, 2024 and 2023, respectively. During the three months ended March 31, 2024, we renewed various wireless licenses in accordance with FCC regulations. The average renewal period for these licenses was 10 years. 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. Other Intangible Assets 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 |
The amortization expense for Other intangible assets was as follows:
|  |  | Three Months Ended
(dollars in millions) |  |  | March 31,
2024 |  |  | $ | 698 |
2023 |  |  | 647 |
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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