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Common and Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2020
Common And Preferred Stock [Abstract]  
Schedule of Share Repurchases
In millions, except per share amounts
  
2020
    
2019
    
2018
 
Number of shares purchased or repurchased
     26.4        11.1        5.8  
Average price paid per share
   $ 7.50      $ 9.12      $ 8.21  
Remaining authorization as of December 31
   $      $ 101      $ 202