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Debt (Secured Tower Revenue Securities) (Narrative) (Details) - USD ($)
9 Months Ended
Oct. 11, 2024
Sep. 30, 2024
Sep. 11, 2024
Dec. 31, 2023
Sep. 30, 2023
Debt Instrument [Line Items]          
Principal Balance   $ 12,388,500,000   $ 12,388,000,000  
2024-2C Tower Securities [Member]          
Debt Instrument [Line Items]          
Aggregate amount     $ 620,000,000.0    
Debt Instrument Interest Rate Effective Percentage     4.654%    
2014-2C Tower Securities [Member]          
Debt Instrument [Line Items]          
Interest Rate   3.869%      
Anticipated Repayment Date   Oct. 08, 2024      
Principal Balance   $ 620,000,000   620,000,000  
2019-1C Tower Securities [Member]          
Debt Instrument [Line Items]          
Interest Rate   2.836%      
Anticipated Repayment Date   Jan. 12, 2025      
Derivative basis spread on variable interest rate   0.10%      
Principal Balance   $ 1,165,000,000   $ 1,165,000,000  
2019-1R Tower Securities [Member]          
Debt Instrument [Line Items]          
Principal Balance         $ 61,400,000
Subsequent Event [Member] | 2024 Tower Securities [Member]          
Debt Instrument [Line Items]          
Deferred financing fees $ 17,600,000        
Net proceed from Tower offerings held in escrow 1,165,000,000        
Principal Balance $ 2,070,000,000.00        
Debt Instrument Interest Rate Effective Percentage 4.778%        
Maturity period 4 years 4 months 24 days        
Subsequent Event [Member] | 2024-1C Tower Securities [Member]          
Debt Instrument [Line Items]          
Interest Rate 4.831%        
Anticipated Repayment Date Oct. 09, 2029        
Final Maturity Date Oct. 08, 2054        
Principal Balance $ 1,450,000,000        
Debt Instrument Interest Rate Effective Percentage 4.831%        
Subsequent Event [Member] | 2024-2C Tower Securities [Member]          
Debt Instrument [Line Items]          
Interest Rate 5.115%        
Anticipated Repayment Date Oct. 08, 2027        
Final Maturity Date Oct. 08, 2054        
Principal Balance $ 620,000,000.0        
Debt Instrument Interest Rate Effective Percentage 4.654%        
Subsequent Event [Member] | 2024-1R Tower Securities [Member]          
Debt Instrument [Line Items]          
Interest Rate 6.252%        
Anticipated Repayment Date Oct. 09, 2029        
Final Maturity Date Oct. 08, 2054        
Principal Balance $ 108,700,000        
Subsequent Event [Member] | 2014-2C Tower Securities [Member]          
Debt Instrument [Line Items]          
Principal Balance $ 620,000,000.0        
Debt Instrument Interest Rate Effective Percentage 4.654%        
Subsequent Event [Member] | 2019-1C Tower Securities [Member]          
Debt Instrument [Line Items]          
Principal Balance $ 1,165,000,000