SoftBank Equity Transaction - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Jun. 26, 2020	Jun. 22, 2020	Dec. 31, 2021	Dec. 31, 2020	Aug. 03, 2020
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)				5,000,000
Rights Offering
Subsidiary, Sale of Stock [Line Items]
Price per share in public offering (in USD per share)	$ 103.00
Additional paid-in capital
Subsidiary, Sale of Stock [Line Items]
Payment received to facilitate SoftBank Monetization			$ 304
Public Equity Offering
Subsidiary, Sale of Stock [Line Items]
Payment received to facilitate SoftBank Monetization		$ 304
Shares sold (in shares)	154,100,000
Public Equity Offering | Third-party trust
Subsidiary, Sale of Stock [Line Items]
Shares sold (in shares)	19,400,000
Public Equity Offering | Additional paid-in capital
Subsidiary, Sale of Stock [Line Items]
Payment received, net of tax		$ 230
Rights Offering | Warrants and Rights Subject to Mandatory Redemption
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 (in shares)		198,000,000
Percentage of stock held			4.90%
SoftBank | DT | Direct and Indirect Call Option
Subsidiary, Sale of Stock [Line Items]
Option to purchase shares (in shares) (up to)				101,500,000
SoftBank | DT | Fixed-Price Call Option
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)		$ 101.46
SoftBank | DT | Floating-Price Call Option
Subsidiary, Sale of Stock [Line Items]
Option to purchase shares (in shares) (up to)		56,600,000
Other Stockholders
Subsidiary, Sale of Stock [Line Items]
Percentage of stock held			48.40%
DT
Subsidiary, Sale of Stock [Line Items]
Percentage of stock held			46.70%
Voting control, percentage			52.00%