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Franchises, Goodwill and Other Intangible Assets (Notes) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Franchises, Goodwill and Other Intangible Assets | Franchises, Goodwill and Other Intangible Assets Indefinite-lived and finite-lived intangible assets consist of the following as of September 30, 2021 and December 31, 2020:
|  | September 30, 2021 |  | December 31, 2020
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |
Franchises |  | $ | 67,322 |  |  | $ | — |  |  | $ | 67,322 |  |  | $ | 67,322 |  |  | $ | — |  |  | $ | 67,322 |
Goodwill |  | 29,554 |  |  | — |  |  | 29,554 |  |  | 29,554 |  |  | — |  |  | 29,554 |
Wireless spectrum licenses |  | 464 |  |  | — |  |  | 464 |  |  | 464 |  |  | — |  |  | 464 |
Trademarks |  | 159 |  |  | — |  |  | 159 |  |  | 159 |  |  | — |  |  | 159 |
|  | $ | 97,499 |  |  | $ | — |  |  | $ | 97,499 |  |  | $ | 97,499 |  |  | $ | — |  |  | $ | 97,499 |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 18,232 |  |  | $ | (13,813) |  |  | $ | 4,419 |  |  | $ | 18,230 |  |  | $ | (12,615) |  |  | $ | 5,615 |
Other intangible assets |  | 420 |  |  | (187) |  |  | 233 |  |  | 420 |  |  | (159) |  |  | 261 |
|  | $ | 18,652 |  |  | $ | (14,000) |  |  | $ | 4,652 |  |  | $ | 18,650 |  |  | $ | (12,774) |  |  | $ | 5,876 |
Amortization expense related to customer relationships and other intangible assets for the three and nine months ended September 30, 2021 was $377 million and $1.2 billion, respectively, and $445 million and $1.4 billion for the three and nine months ended September 30, 2020, respectively. The Company expects amortization expense on its finite-lived intangible assets will be as follows:
Three months ended December 31, 2021 |  | $ | 375 |
2022 |  | 1,332 |
2023 |  | 1,075 |
2024 |  | 824 |
2025 |  | 576 |
Thereafter |  | 470 |
|  | $ | 4,652 |
Actual amortization expense in future periods could differ from these estimates as a result of new intangible asset acquisitions or divestitures, changes in useful lives, impairments, adoption of new accounting standards and other relevant factors.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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