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Business Combinations - Schedule of Components of Consideration Transferred (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2020
Feb. 20, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Business Acquisition [Line Items]              
Payment received from selling shareholder     $ (1,886) $ 0 $ (1,916) $ (5,000)  
Share price at closing (in USD per share)             $ 83.90
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            
Sprint | SoftBank | Common Stock Outstanding              
Business Acquisition [Line Items]              
Aggregate surrendered (in shares)   48,751,557