v3.26.1
Debt (Secured Tower Revenue Securities) (Narrative) (Details) - USD ($)
3 Months Ended
Jan. 30, 2026
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Debt Instrument [Line Items]        
Repayment of tower securities   $ 750,000,000 $ 1,165,000,000  
Amount Outstanding   13,014,000,000   $ 12,959,750,000
2020-2C Tower Securities [Member]        
Debt Instrument [Line Items]        
Repayment of tower securities   750,000,000.0    
Amount Outstanding   600,000,000   $ 600,000,000
2020-2R Tower Securities [Member]        
Debt Instrument [Line Items]        
Repayment of tower securities $ 39,500,000      
Amount Outstanding   $ 31,600,000