v3.22.0.1
Business Combinations - Schedule of Components of Consideration Transferred (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 01, 2020
Feb. 20, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Business Acquisition [Line Items]            
Payment received from selling shareholder     $ (1,916) $ (5,000) $ (31)  
Sprint            
Business Acquisition [Line Items]            
Fair value of T-Mobile common stock issued to Sprint stockholders $ 31,328          
Fair value of T-Mobile replacement equity awards attributable to pre-combination service 323          
Repayments of Sprint's debt (including accrued interest, prepayment penalties) 7,396          
Value of contingent consideration 1,882          
Payment received from selling shareholder (102)          
Total consideration exchanged $ 40,827          
Merger consideration (in shares) 373,396,310          
Exchange ratio (in shares) 0.10256          
Share price at closing (in USD per share)           $ 83.90
Sprint | SoftBank | Common Stock Outstanding            
Business Acquisition [Line Items]            
Aggregate surrendered (in shares)   48,751,557