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Intangible Assets, Goodwill and Other | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill There were no changes in the carrying value of goodwill during the years ended December 31, 2021 and 2020. Intangibles The following is a summary of the Company's intangible assets.
| As of December 31, 2021 |  | As of December 31, 2020
| Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Book Value
Site rental contracts and tenant relationships | $ | 7,854 |  |  | $ | (3,872) |  |  | $ | 3,982 |  |  | $ | 7,797 |  |  | $ | (3,432) |  |  | $ | 4,365 |
Other intangible assets | 143 |  |  | (79) |  |  | 64 |  |  | 143 |  |  | (75) |  |  | 68 |
Total | $ | 7,997 |  |  | $ | (3,951) |  |  | $ | 4,046 |  |  | $ | 7,940 |  |  | $ | (3,507) |  |  | $ | 4,433 |
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 $444 million, $439 million, and $428 million for the years ended December 31, 2021, 2020 and 2019, respectively. The estimated annual amortization expense related to intangible assets for the years ending December 31, 2022 to 2026 is as follows:
| Years Ending December 31,
| 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026
Estimated annual amortization | $ | 447 |  |  | $ | 445 |  |  | $ | 396 |  |  | $ | 374 |  |  | $ | 370 |

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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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