Intangible Assets, Goodwill and Other

12 Months Ended

Dec. 31, 2022

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, 2022 and 2021. Additions due to acquisitions during the period were $7 million.

Intangible Assets

The following is a summary of the Company's intangible assets.

	As of December 31, 2022						As of December 31, 2021
	Gross Carrying Value		Accumulated Amortization		Net Book Value		Gross Carrying Value		Accumulated Amortization		Net Book Value
Site rental contracts and tenant relationships	$	7,850	$	(4,315)	$	3,535	$	7,854	$	(3,872)	$	3,982
Other intangible assets	143		(82)		61		143		(79)		64
Total	$	7,993	$	(4,397)	$	3,596	$	7,997	$	(3,951)	$	4,046

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 $446 million, $444 million, and $439 million for the years ended December 31, 2022, 2021 and 2020, respectively.

The estimated annual amortization expense related to intangible assets for the years ending December 31, 2023 to 2027 is as follows:

	Years Ending December 31,
	2023		2024		2025		2026		2027
Estimated annual amortization	$	446	$	396	$	375	$	370	$	287