v3.25.3
Debt - Schedule of Issuances and Borrowings (Details) - USD ($)
 9 Months Ended
Aug. 06, 2025
Aug. 05, 2025
Mar. 27, 2025
Mar. 17, 2025
Feb. 27, 2025
Feb. 11, 2025
Sep. 30, 2025
Aug. 01, 2025
Debt Instrument [Line Items]                
Principal Issuances             $ 10,027,000,000  
Discounts/Premiums and Issuance Costs, Net             (108,000,000)  
Net Proceeds from Issuance of Long-Term Debt             8,266,000,000  
UScellular Wireless Assets Operations | Master License Agreement                
Debt Instrument [Line Items]                
Principal Issuances   $ 1,700,000,000           $ 1,700,000,000
Senior Notes                
Debt Instrument [Line Items]                
Principal Issuances             8,027,000,000  
Discounts/Premiums and Issuance Costs, Net             (74,000,000)  
Net Proceeds from Issuance of Long-Term Debt             6,300,000,000  
ABS Notes                
Debt Instrument [Line Items]                
Principal Issuances             1,000,000,000  
Discounts/Premiums and Issuance Costs, Net             (4,000,000)  
Net Proceeds from Issuance of Long-Term Debt             996,000,000  
Loans Payable                
Debt Instrument [Line Items]                
Principal Issuances             1,000,000,000  
Discounts/Premiums and Issuance Costs, Net             (30,000,000)  
Net Proceeds from Issuance of Long-Term Debt             $ 970,000,000  
3.150% Senior Notes due 2032 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage           3.15%    
Principal Issuances           $ 1,036,000,000    
Discounts/Premiums and Issuance Costs, Net           (5,000,000)    
Net Proceeds from Issuance of Long-Term Debt           $ 1,031,000,000    
3.500% Senior Notes due 2037 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage           3.50%    
Principal Issuances           $ 1,036,000,000    
Discounts/Premiums and Issuance Costs, Net           (8,000,000)    
Net Proceeds from Issuance of Long-Term Debt           $ 1,028,000,000    
3.800% Senior Notes due 2045 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage           3.80%    
Principal Issuances           $ 777,000,000    
Discounts/Premiums and Issuance Costs, Net           (7,000,000)    
Net Proceeds from Issuance of Long-Term Debt           $ 770,000,000    
5.125% Senior Notes due 2032 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage     5.125%          
Principal Issuances     $ 1,250,000,000          
Discounts/Premiums and Issuance Costs, Net     (7,000,000)          
Net Proceeds from Issuance of Long-Term Debt     $ 1,243,000,000          
5.300% Senior Notes due 2035 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage     5.30%          
Principal Issuances     $ 1,000,000,000          
Discounts/Premiums and Issuance Costs, Net     (7,000,000)          
Net Proceeds from Issuance of Long-Term Debt     $ 993,000,000          
5.875% Senior Notes due 2055 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage     5.875%          
Principal Issuances     $ 1,250,000,000          
Discounts/Premiums and Issuance Costs, Net     (15,000,000)          
Net Proceeds from Issuance of Long-Term Debt     $ 1,235,000,000          
6.700% Senior Notes due 2033 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage   6.70%            
Principal Issuances   $ 489,000,000            
Discounts/Premiums and Issuance Costs, Net   56,000,000            
Net Proceeds from Issuance of Long-Term Debt   $ 0            
6.250% Senior Notes due 2069 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage   6.25%            
Principal Issuances   $ 393,000,000            
Discounts/Premiums and Issuance Costs, Net   3,000,000            
Net Proceeds from Issuance of Long-Term Debt   $ 0            
5.500% Senior Notes due March 2070 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage   5.50%            
Principal Issuances   $ 401,000,000            
Discounts/Premiums and Issuance Costs, Net   (42,000,000)            
Net Proceeds from Issuance of Long-Term Debt   $ 0            
5.500% Senior Notes due June 2070 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage   5.50%            
Principal Issuances   $ 395,000,000            
Discounts/Premiums and Issuance Costs, Net   (42,000,000)            
Net Proceeds from Issuance of Long-Term Debt   $ 0            
4.740% Class A Senior ABS Notes due 2029 | ABS Notes due 2029                
Debt Instrument [Line Items]                
Interest rate, stated percentage         4.74%      
Principal Issuances         $ 500,000,000      
Discounts/Premiums and Issuance Costs, Net         (2,000,000)      
Net Proceeds from Issuance of Long-Term Debt         $ 498,000,000      
4.340% Class A Senior ABS Notes due 2030 | ABS Notes Due 2030                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.34%              
Principal Issuances $ 500,000,000              
Discounts/Premiums and Issuance Costs, Net (2,000,000)              
Net Proceeds from Issuance of Long-Term Debt $ 498,000,000              
4.927% ECA Facility due March 2036 | Loans Payable                
Debt Instrument [Line Items]                
Interest rate, stated percentage       4.927%        
Principal Issuances       $ 1,000,000,000.0        
Discounts/Premiums and Issuance Costs, Net       (30,000,000)        
Net Proceeds from Issuance of Long-Term Debt       $ 970,000,000