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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2020
Text Block [Abstract]  
Operating Leases Of Lessee Disclosure
          
          
$ in millions
  
As of
June 30, 2020
 
  
Balance Sheet Location
 
Right-of-use
asset
  
$
20    
 
  
 
Other assets
 
Lease liability
  
$
20    
 
  
 
Other liabilities
 
Weighted average remaining lease term (years)
  
 
8.3    
 
  
Discount rate used for operating leases
  
 
7.5% 
 
  
Total future minimum lease payments
  
$
30