v3.20.2
SoftBank Equity Transaction - Narrative (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Aug. 03, 2020
shares
Jul. 16, 2020
shares
Jun. 26, 2020
$ / shares
shares
Jun. 22, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Valuation, Income Approach          
Subsidiary, Sale of Stock [Line Items]          
Fair value of each call option, estimate | $         $ 875
Marcelo Claure | Subsequent Event          
Subsidiary, Sale of Stock [Line Items]          
Shares sold   5,000,000.0      
Additional paid-in capital          
Subsidiary, Sale of Stock [Line Items]          
Payment received to facilitate SoftBank Monetization | $         $ 300
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 | $       $ 300  
Shares sold     154,100,000    
Public Equity Offering | Third-party trust          
Subsidiary, Sale of Stock [Line Items]          
Shares sold     19,400,000    
Public Equity Offering | Additional paid-in capital          
Subsidiary, Sale of Stock [Line Items]          
Payment received, net of tax | $       $ 226  
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    
Rights Offering | Warrants and Rights Subject to Mandatory Redemption | Subsequent Event          
Subsidiary, Sale of Stock [Line Items]          
Option to purchase common stock (in shares) (up to) 19,750,000        
SoftBank          
Subsidiary, Sale of Stock [Line Items]          
Shares of common stock held by SoftBank       198,000,000  
SoftBank | Subsequent Event          
Subsidiary, Sale of Stock [Line Items]          
Percentage of stock held 8.60%        
SoftBank | Direct and Indirect Call Option | DT          
Subsidiary, Sale of Stock [Line Items]          
Option to purchase shares (in shares) (up to)       101,500,000  
SoftBank | Fixed-Price Call Option | DT          
Subsidiary, Sale of Stock [Line Items]          
Option to purchase shares (in shares) (up to)       44,900,000  
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)       56,600,000  
DT | Subsequent Event          
Subsidiary, Sale of Stock [Line Items]          
Percentage of stock held 43.40%        
Other Stockholders | Subsequent Event          
Subsidiary, Sale of Stock [Line Items]          
Percentage of stock held 48.00%