v3.20.4
SoftBank Equity Transaction - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Aug. 03, 2020
Jun. 26, 2020
$ / shares
shares
Jun. 22, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Valuation, Income Approach        
Subsidiary, Sale of Stock [Line Items]        
Fair value of each call option, estimate | $       $ 1,000
Marcelo Claure        
Subsidiary, Sale of Stock [Line Items]        
Shares sold (in shares)       5.0
Rights Offering        
Subsidiary, Sale of Stock [Line Items]        
Price per share in public offering (in USD per share) | $ / shares   $ 103.00    
Public Equity Offering        
Subsidiary, Sale of Stock [Line Items]        
Payment received to facilitate SoftBank Monetization | $     $ 304  
Shares sold (in shares)   154.1    
Public Equity Offering | Third-party trust        
Subsidiary, Sale of Stock [Line Items]        
Shares sold (in shares)   19.4    
Rights Offering | Warrants and Rights Subject to Mandatory Redemption        
Subsidiary, Sale of Stock [Line Items]        
Conversion rate for option to purchase common stock   0.05    
Additional paid-in capital        
Subsidiary, Sale of Stock [Line Items]        
Payment received to facilitate SoftBank Monetization | $       $ 304
Additional paid-in capital | Public Equity Offering        
Subsidiary, Sale of Stock [Line Items]        
Payment received, net of tax | $     $ 230  
SoftBank        
Subsidiary, Sale of Stock [Line Items]        
Shares of common stock held by SoftBank (in shares)     198.0  
Percentage of stock held 8.60%     8.60%
SoftBank | Direct and Indirect Call Option | DT        
Subsidiary, Sale of Stock [Line Items]        
Option to purchase shares (in shares) (up to)       101.5
SoftBank | Fixed-Price Call Option | DT        
Subsidiary, Sale of Stock [Line Items]        
Option to purchase shares (in shares) (up to)     44.9  
Option to purchase shares (in USD per share) | $ / shares     $ 101.46  
SoftBank | Floating-Price Call Option | DT        
Subsidiary, Sale of Stock [Line Items]        
Option to purchase shares (in shares) (up to)     56.6  
Other Stockholders        
Subsidiary, Sale of Stock [Line Items]        
Percentage of stock held 48.00%     48.00%
DT        
Subsidiary, Sale of Stock [Line Items]        
Percentage of stock held 43.40%     43.40%
Voting control, percentage 52.40%     52.30%