v3.22.0.1
Debt - Debt Assumed (Details) - USD ($)
Dec. 31, 2021
May 13, 2021
Mar. 23, 2021
Jan. 14, 2021
Dec. 31, 2020
Apr. 06, 2020
Apr. 01, 2020
Mar. 31, 2018
Debt Instrument [Line Items]                
Carrying value $ 74,193,000,000       $ 71,125,000,000      
Senior Notes                
Debt Instrument [Line Items]                
Principal outstanding   $ 3,000,000,000 $ 3,800,000,000 $ 3,000,000,000   $ 19,000,000,000    
3.360% Series 2016-1 A-1 Notes due 2021 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage 3.36%              
4.738% Series 2018-1 A-1 Notes due 2025 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.738%              
Sprint                
Debt Instrument [Line Items]                
Fair value             $ 31,797,000,000  
Principal outstanding $ 20,049,000,000              
Carrying value 21,720,000,000              
Sprint | 7.250% Senior Notes due 2021 | Senior Notes                
Debt Instrument [Line Items]                
Fair value             2,324,000,000  
Principal outstanding 0              
Carrying value $ 0              
Sprint | 7.875% Senior Notes due 2023                
Debt Instrument [Line Items]                
Interest rate, stated percentage 7.875%              
Sprint | 7.875% Senior Notes due 2023 | Senior Notes                
Debt Instrument [Line Items]                
Fair value             4,682,000,000  
Principal outstanding $ 4,250,000,000              
Carrying value $ 4,472,000,000              
Sprint | 7.125% Senior Notes due 2024                
Debt Instrument [Line Items]                
Interest rate, stated percentage 7.125%              
Sprint | 7.125% Senior Notes due 2024 | Senior Notes                
Debt Instrument [Line Items]                
Fair value             2,746,000,000  
Principal outstanding $ 2,500,000,000              
Carrying value $ 2,650,000,000              
Sprint | 7.625% Senior Notes due 2025                
Debt Instrument [Line Items]                
Interest rate, stated percentage 7.625%              
Sprint | 7.625% Senior Notes due 2025 | Senior Notes                
Debt Instrument [Line Items]                
Fair value             1,677,000,000  
Principal outstanding $ 1,500,000,000              
Carrying value $ 1,618,000,000              
Sprint | 7.625% Senior Notes due 2026                
Debt Instrument [Line Items]                
Interest rate, stated percentage 7.625%              
Sprint | 7.625% Senior Notes due 2026 | Senior Notes                
Debt Instrument [Line Items]                
Fair value             1,701,000,000  
Principal outstanding $ 1,500,000,000              
Carrying value $ 1,648,000,000              
Sprint | 3.360% Series 2016-1 A-1 Notes due 2021                
Debt Instrument [Line Items]                
Interest rate, stated percentage 3.36%              
Fair value             1,310,000,000  
Principal outstanding $ 0              
Carrying value $ 0              
Sprint | 3.360% Series 2016-1 A-1 Notes due 2021 | Senior Notes                
Debt Instrument [Line Items]                
Principal outstanding             3,500,000,000  
Sprint | 4.738% Series 2018-1 A-1 Notes due 2025                
Debt Instrument [Line Items]                
Interest rate, stated percentage 4.738%              
Fair value             2,153,000,000  
Principal outstanding $ 1,706,000,000             $ 2,100,000,000
Carrying value $ 1,735,000,000              
Sprint | 5.152% Series 2018-1 A-2 Notes due 2028                
Debt Instrument [Line Items]                
Interest rate, stated percentage 5.152%              
Fair value             $ 1,960,000,000  
Principal outstanding $ 1,838,000,000              
Carrying value 1,936,000,000              
Sprint | 7.000% Senior Notes due 2020 | Senior Notes                
Debt Instrument [Line Items]                
Interest rate, stated percentage             7.00%  
Fair value             $ 1,510,000,000  
Principal outstanding 0              
Carrying value $ 0              
Sprint | 11.500% Senior Notes due 2021                
Debt Instrument [Line Items]                
Interest rate, stated percentage 11.50%              
Sprint | 11.500% Senior Notes due 2021 | Senior Notes                
Debt Instrument [Line Items]                
Fair value             1,105,000,000  
Principal outstanding $ 0              
Carrying value $ 0              
Sprint | 6.000% Senior Notes due 2022                
Debt Instrument [Line Items]                
Interest rate, stated percentage 6.00%              
Sprint | 6.000% Senior Notes due 2022 | Senior Notes                
Debt Instrument [Line Items]                
Fair value             2,372,000,000  
Principal outstanding $ 2,280,000,000              
Carrying value $ 2,312,000,000              
Sprint | 6.875% Senior Notes due 2028                
Debt Instrument [Line Items]                
Interest rate, stated percentage 6.875%              
Sprint | 6.875% Senior Notes due 2028 | Senior Notes                
Debt Instrument [Line Items]                
Fair value             2,834,000,000  
Principal outstanding $ 2,475,000,000              
Carrying value $ 2,772,000,000              
Sprint | 8.750% Senior Notes due 2032                
Debt Instrument [Line Items]                
Interest rate, stated percentage 8.75%              
Sprint | 8.750% Senior Notes due 2032 | Senior Notes                
Debt Instrument [Line Items]                
Fair value             2,649,000,000  
Principal outstanding $ 2,000,000,000              
Carrying value 2,577,000,000              
Sprint | Accounts receivable facility                
Debt Instrument [Line Items]                
Fair value             2,310,000,000  
Principal outstanding 0              
Carrying value 0              
Sprint | Other debt                
Debt Instrument [Line Items]                
Fair value             $ 464,000,000  
Principal outstanding 0              
Carrying value $ 0