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Segment Data (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2025 segment	Dec. 31, 2024 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of business segments	2
Number of reportable segments	2
2019-1C Tower Securities [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Cash held in escrow | $		$ 1,165

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- Definition

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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-Topic 280
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of noncurrent assets that are pledged or subject to withdrawal restrictions, classified as other.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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