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Debt (Tower Securities - Schedule of Material Terms of Debt Outstanding) (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2022
Dec. 31, 2023
Debt Instrument [Line Items]      
Amount Outstanding $ 13,672,750,000   $ 12,388,000,000
Proceeds from issuance of secured debt $ 2,052,136,000 $ 839,885,000  
2014-2C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Oct. 15, 2014    
Amount Outstanding $ 620,000,000.0   620,000,000
Interest Rate 3.869%    
Anticipated Repayment Date Oct. 08, 2024    
Deferred financing fees $ 9,000,000.0    
Repayments of long-term debt $ 620,000,000.0    
2019-1C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Sep. 13, 2019    
Amount Outstanding $ 1,165,000,000   1,165,000,000
Interest Rate 2.836%    
Anticipated Repayment Date Jan. 12, 2025    
Final Maturity Date Jan. 12, 2050    
Deferred financing fees $ 12,800,000    
Proceeds from issuance of secured debt $ 1,165,000,000.0    
2020-1C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Jul. 14, 2020    
Amount Outstanding $ 750,000,000   750,000,000
Interest Rate 1.884%    
Anticipated Repayment Date Jan. 09, 2026    
Final Maturity Date Jul. 11, 2050    
Deferred financing fees $ 8,000,000.0    
2020-2C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Jul. 14, 2020    
Amount Outstanding $ 600,000,000   600,000,000
Interest Rate 2.328%    
Anticipated Repayment Date Jan. 11, 2028    
Final Maturity Date Jul. 09, 2052    
Deferred financing fees $ 6,400,000    
2021-1C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date May 14, 2021    
Amount Outstanding $ 1,165,000,000   1,165,000,000
Interest Rate 1.631%    
Anticipated Repayment Date Nov. 09, 2026    
Final Maturity Date May 09, 2051    
Deferred financing fees $ 12,900,000    
2021-2C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Oct. 27, 2021    
Amount Outstanding $ 895,000,000   895,000,000
Interest Rate 1.84%    
Anticipated Repayment Date Apr. 09, 2027    
Final Maturity Date Oct. 10, 2051    
Deferred financing fees $ 9,500,000    
2021-3C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Oct. 27, 2021    
Amount Outstanding $ 895,000,000   895,000,000
Interest Rate 2.593%    
Anticipated Repayment Date Oct. 09, 2031    
Final Maturity Date Oct. 10, 2056    
Deferred financing fees $ 9,500,000    
2022-1C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Nov. 23, 2022    
Amount Outstanding $ 850,000,000   $ 850,000,000
Interest Rate 6.599%    
Anticipated Repayment Date Jan. 11, 2028    
Final Maturity Date Nov. 09, 2052    
Deferred financing fees $ 10,500,000    
2024-1C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Oct. 11, 2024    
Amount Outstanding $ 1,450,000,000    
Interest Rate 4.831%    
Anticipated Repayment Date Oct. 09, 2029    
Final Maturity Date Oct. 08, 2054    
Deferred financing fees $ 12,500,000    
2024-2C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Oct. 11, 2024    
Amount Outstanding $ 620,000,000    
Interest Rate 4.654%    
Anticipated Repayment Date Oct. 08, 2027    
Final Maturity Date Oct. 08, 2054    
Deferred financing fees $ 5,400,000    
2018-1C Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Mar. 09, 2018    
Amount Outstanding $ 640,000,000.0    
Interest Rate 3.448%    
Anticipated Repayment Date Mar. 09, 2023    
Deferred financing fees $ 8,600,000    
2019-1R Tower Securities [Member]      
Debt Instrument [Line Items]      
Issue Date Sep. 13, 2019    
Amount Outstanding $ 61,400,000    
Interest Rate 4.213%    
Anticipated Repayment Date Jan. 12, 2025    
Final Maturity Date Jan. 12, 2050    
Proceeds from issuance of secured debt $ 61,400,000