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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Operating Leases Of Lessee Disclosure
$ in millions
  
As of

December 31, 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
   $ 29