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Note 6 - Redeemable, Convertible Preferred Stock (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Temporary Equity [Table Text Block]
  

September 30,

  

December 31,

 

(in millions)

 

2023

  

2022

 

Series B preferred stock

 $96  $95 

Series C preferred stock

  112   108 

Total

 $208  $203