v3.24.0.1
Debt - Narrative (Details)
12 Months Ended
Jan. 12, 2024
USD ($)
Oct. 12, 2022
USD ($)
Apr. 01, 2020
USD ($)
instrument
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jul. 25, 2023
USD ($)
Oct. 17, 2022
USD ($)
Debt Instrument [Line Items]              
Effective interest rate       4.00% 3.90%    
Weighted-average debt outstanding during period       $ 75,400,000,000 $ 72,500,000,000    
Short-term debt       3,619,000,000 5,164,000,000    
Letters of credit, amount outstanding       238,000,000 352,000,000    
Spectrum Financing Special Purpose Entity              
Debt Instrument [Line Items]              
Lease payments (per month)     $ 165,000,000        
Sprint              
Debt Instrument [Line Items]              
Total outstanding obligation       2,200,000,000 $ 3,000,000,000    
Senior Notes              
Debt Instrument [Line Items]              
Principal Issuances       8,500,000,000      
Net Proceeds from Issuance of Long-Term Debt       $ 8,446,000,000      
Senior Notes | Sprint              
Debt Instrument [Line Items]              
Principal Issuances     3,900,000,000        
Senior Notes | Subsequent Event              
Debt Instrument [Line Items]              
Net Proceeds from Issuance of Long-Term Debt $ 3,000,000,000            
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Financing commitment, amount             $ 7,500,000,000
Debt instrument, covenant, leverage ratio             4.5
Line of Credit | Letter of Credit              
Debt Instrument [Line Items]              
Financing commitment, amount             $ 1,500,000,000
Line of Credit | Bridge Loan              
Debt Instrument [Line Items]              
Financing commitment, amount             $ 500,000,000
ABS Notes              
Debt Instrument [Line Items]              
Principal Issuances   $ 750,000,000          
Carrying amounts of deferred purchase price assets   $ 982,000,000          
Expected weighted average life   2 years 6 months          
Payable term   2 years          
Commercial Paper              
Debt Instrument [Line Items]              
Financing commitment, amount           $ 2,000,000,000  
4.850% Senior Notes Due 2029 | Senior Notes | Subsequent Event              
Debt Instrument [Line Items]              
Principal Issuances $ 1,000,000,000            
Interest rate, stated percentage 4.85%            
5.150% Senior Notes Due 2034 | Senior Notes | Subsequent Event              
Debt Instrument [Line Items]              
Principal Issuances $ 1,300,000,000            
Interest rate, stated percentage 5.15%            
5.500% Senior Notes Due 2055 | Senior Notes | Subsequent Event              
Debt Instrument [Line Items]              
Principal Issuances $ 750,000,000            
Interest rate, stated percentage 5.50%            
A Senior Class | ABS Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage   4.91%          
3.360% Senior Secured Series 2016-1 A-1 Notes due 2021 | Senior Notes | Sprint              
Debt Instrument [Line Items]              
Principal Issuances     $ 3,500,000,000        
Interest rate, stated percentage       3.36%      
Payable term     5 years        
Securitization program amount     $ 7,000,000,000        
Number of instruments | instrument     2        
4.738% Series 2018-1 A-1 Notes due 2025 | Sprint              
Debt Instrument [Line Items]              
Principal Issuances     $ 2,100,000,000        
4.738% Series 2018-1 A-1 Notes due 2025 | Senior Notes              
Debt Instrument [Line Items]              
Interest rate, stated percentage       4.738%      
4.738% Series 2018-1 A-1 Notes due 2025 | Senior Notes | Sprint              
Debt Instrument [Line Items]              
Interest rate, stated percentage       4.738%      
Short-term debt       $ 525,000,000      
5.152% Series 2018-1 A-2 Notes due 2028 | Sprint              
Debt Instrument [Line Items]              
Short-term debt       368,000,000      
5.152% Series 2018-1 A-2 Notes due 2028 | Senior Notes | Sprint              
Debt Instrument [Line Items]              
Principal Issuances       $ 1,800,000,000      
Interest rate, stated percentage       5.152%      
Minimum | Senior Secured Notes Issued in 2021 | Senior Notes              
Debt Instrument [Line Items]              
Term preceding maturity date       1 year      
Maximum | Senior Secured Notes Issued in 2021 | Senior Notes              
Debt Instrument [Line Items]              
Term preceding maturity date       3 years