For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Segment Data (Narrative) (Details) $ in Billions	3 Months Ended		9 Months Ended
Segment Data (Narrative) (Details) $ in Billions	Sep. 30, 2023 USD ($)	Sep. 30, 2022	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022	Dec. 31, 2022 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of business segments \| segment			2
Number of reportable segments \| segment			2
Domestic Site Leasing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 5.6		$ 5.6		$ 5.9
International Site Leasing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	3.4		3.4		3.5
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2.1		$ 2.1		$ 2.0
Foreign Countries, Other than Brazil [Member] \| Long-Lived Assets [Member] \| Maximum [Member] \| Geographic Concentration Risk [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage	5.00%	5.00%	5.00%	5.00%