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Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Revenue, Remaining Performance Obligation, Amount $ 2,000   $ 2,100 $ 2,300
Revenue Recognized on Deferred Revenues 139 $ 166    
Contracted Amounts Receivable from Customers, remainder of year [1] 3,826      
Contracted Amounts Receivable from Customers, in Two Years [1] 4,804      
Contracted Amounts Receivable from Customers, in Three Years [1] 4,653      
Contracted Amounts Receivable from Customers, in Four Years [1] 4,545      
Contracted Amounts Receivable from Customers, in Five Years [1] 4,330      
Contracted Amounts Receivable from Customers, Thereafter [1] 15,966      
Lessor, Operating Lease, Payments to be Received [1] 38,124      
Site rental revenue - remaining rental obligation $ 3 $ 48    
Minimum [Member]        
Revenue Recognition Non-cancelable Lease Term for Wireless Tenants five      
Revenue Recognition for Fiber Solutions Tenants one      
Revenue, Performance Obligation, Description of Payment Terms 45      
Maximum [Member]        
Revenue Recognition Non-cancelable Lease Term for Wireless Tenants 15      
Revenue Recognition for Fiber Solutions Tenants 20      
Revenue, Performance Obligation, Description of Payment Terms 90      
[1] Based on the nature of the contract, tenant contracts are accounted for pursuant to relevant lease accounting (ASC 842) or revenue accounting (ASC 606) guidance. Excludes amounts related to services, as those contracts generally have a duration of one year or less.