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Intangible Assets, Goodwill and Other | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill The carrying value of goodwill was $10.1 billion for each of the years ended December 31, 2023 and 2022. For the year ended December 31, 2022, additions due to acquisitions were $7 million. There were no additions during the year ended December 31, 2023. Intangible Assets The following is a summary of the Company's intangible assets.
| As of December 31, 2023 |  | As of December 31, 2022
| Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value
Site rental contracts and tenant relationships | $ | 7,880 |  |  | $ | (4,758) |  |  | $ | 3,122 |  |  | $ | 7,850 |  |  | $ | (4,315) |  |  | $ | 3,535 |
Other intangible assets | 113 |  |  | (56) |  |  | 57 |  |  | 143 |  |  | (82) |  |  | 61 |
Total | $ | 7,993 |  |  | $ | (4,814) |  |  | $ | 3,179 |  |  | $ | 7,993 |  |  | $ | (4,397) |  |  | $ | 3,596 |
Amortization expense related to intangible assets is classified as "Depreciation, amortization and accretion" on the Company's consolidated statement of operations and comprehensive income (loss) and was $447 million, $446 million, and $444 million for the years ended December 31, 2023, 2022 and 2021, respectively. The estimated annual amortization expense related to intangible assets for the years ending December 31, 2024 to 2028 is as follows:
| Years Ending December 31,
| 2024 |  | 2025 |  | 2026 |  | 2027 |  | 2028
Estimated annual amortization | $ | 398 |  |  | $ | 376 |  |  | $ | 372 |  |  | $ | 288 |  |  | $ | 284 |

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