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Note 6 - Redeemable, Convertible Preferred Stock (Tables)
9 Months Ended
Sep. 30, 2021
Temporary Equity Disclosure [Abstract]  
Summary of Redeemable Convertible Preferred Stock

 

Redeemable convertible preferred stock was as follows at September 30, 2021 and December 31, 2020:

 

 

 

September 30,

 

 

December 31,

 

(in millions)

 

2021

 

 

2020

 

Series A preferred stock

 

$

 

 

$

191

 

Series B preferred stock

 

 

94

 

 

 

 

Series C preferred stock

 

 

101

 

 

 

 

Total

 

$

195

 

 

$

191