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Restructuring and Related Activities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges $ 45 $ 0 $ 56      
Towers [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 6          
Fiber [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 31          
Other Segments            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 19          
Forecast            
Restructuring Cost and Reserve [Line Items]            
Restructuring and Related Cost, Expected Cost Remaining       $ 70    
2023 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 2   13      
Payments for Restructuring (7)   (19)      
Restructuring Reserve, Settled without Cash 0   (4)      
Restructuring Reserve 18   18   $ 23 $ 28
Employee headcount reduction   15.00%        
2024 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 43   43      
Payments for Restructuring (2)   (2)      
Restructuring Reserve, Settled without Cash (7)   (7)      
Restructuring Reserve $ 34   $ 34      
Employee headcount reduction 10.00%   10.00%      
Employee Severance | 2023 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges $ 1   $ 1      
Payments for Restructuring (3)   (11)      
Restructuring Reserve, Settled without Cash 0   0      
Restructuring Reserve 6   6   8 16
Employee Severance | 2024 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 36   36      
Payments for Restructuring (2)   (2)      
Restructuring Reserve, Settled without Cash 0   0      
Restructuring Reserve 34   34      
Facility Closing | 2023 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 1   12      
Payments for Restructuring (4)   (8)      
Restructuring Reserve, Settled without Cash 0   (4)      
Restructuring Reserve 12   12   $ 15 $ 12
Facility Closing | 2024 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges 7   7      
Payments for Restructuring 0   0      
Restructuring Reserve, Settled without Cash (7)   (7)      
Restructuring Reserve $ 0   0      
Accelerated depreciation and asset write downs | 2023 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Reserve, Settled without Cash     (4)      
Accelerated depreciation and asset write downs | 2024 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Reserve, Settled without Cash     (7)      
Remaining obligations under facility leases | 2023 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Restructuring Charges     $ 8