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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2020
Text Block [Abstract]  
Operating Leases Of Lessee Disclosure
                               
$ in millions
 
As of
March 31, 2020
 
Balance Sheet Location
 
Right-of-use
asset
  $
21
     
Other assets
 
Lease liability
  $
21
     
Other liabilities
 
Weighted average remaining lease term (years)
   
8.3
     
 
Discount rate used for operating leases
   
7.5
%    
 
Total future minimum lease payments
  $
31