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Stock-based Compensation (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based Payment Arrangement, Expense $ 157 $ 156 $ 131
Site Rental Cost of Operations [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based Payment Arrangement, Expense 19 18 14
Services and Other Costs of Operations [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based Payment Arrangement, Expense 10 10 8
Selling, General and Administrative Expenses [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based Payment Arrangement, Expense $ 128 $ 128 $ 109