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Schedule IV - Reinsurance
 12 Months Ended
Dec. 31, 2020
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]  
Supplemental Schedule of Reinsurance Premiums for Insurance Companies
SCHEDULE IV
MBIA INC. AND SUBSIDIARIES
REINSURANCE
Years Ended December 31, 2020, 2019 and 2018
(In millions)
 
Column A
Insurance
Premium Written
   
Column B
Direct
Amount
     
Column C
Ceded to
Others
     
Column D
Assumed
From
Other
Companies
     
Column E
Net
Amount
     
Column F
Percentage
of Amount
Assumed
to Net
  
2020
    $ 1      $ 1      $ —      $ —        0
%
  
    
 
 
     
 
 
     
 
 
     
 
 
     
 
 
  
2019
    $ 3      $ —      $ —      $ 3        0%  
    
 
 
     
 
 
     
 
 
     
 
 
     
 
 
  
2018
    $ 3      $ 1      $ —      $ 2        0%