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Revenues (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Revenue, Remaining Performance Obligation, Amount $ 404   $ 430 $ 623
Revenue Recognized on Deferred Revenues 96 $ 146    
Continuing Operations        
Contracted Amounts Receivable from Customers, remainder of year [1] 996      
Contracted Amounts Receivable from Customers, in Two Years [1] 4,019      
Contracted Amounts Receivable from Customers, in Three Years [1] 4,092      
Contracted Amounts Receivable from Customers, in Four Years [1] 3,971      
Contracted Amounts Receivable from Customers, in Five Years [1] 3,272      
Contracted Amounts Receivable from Customers, Thereafter [1] 11,730      
Lessor, Operating Lease, Payments to be Received [1] $ 28,080      
Minimum [Member]        
Revenue Recognition Non-cancelable Lease Term for Wireless Tenants five      
Revenue, Performance Obligation, Description of Payment Terms 45      
Maximum [Member]        
Revenue Recognition Non-cancelable Lease Term for Wireless Tenants 15      
Revenue, Performance Obligation, Description of Payment Terms 90      
[1] Excludes amounts related to services, as those contracts generally have a duration of one year or less.