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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Segment Data (Narrative) (Details) $ in Millions	3 Months Ended
Segment Data (Narrative) (Details) $ in Millions	Mar. 31, 2025 USD ($) segment	Mar. 31, 2024	Dec. 31, 2024 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of business segments \| segment	2
Number of reportable segments \| segment	2
2019-1C Tower Securities [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Cash held in escrow			$ 1,165
Domestic Site Leasing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 5,700		5,700
International Site Leasing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	3,100		3,000
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,800		$ 1,700
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%