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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2023
Text Block [Abstract]  
Operating Leases Of Lessee Disclosure
          
          
$ in millions
  
As of
March 31, 2023
 
  
Balance Sheet Location
 
Right-of-use
asset
   
$
16
 
   
 
Other assets
 
Lease liability
   
$
16
 
   
 
Other liabilities
 
Weighted average remaining lease term (years)
   
 
7.0
 
         
Discount rate used for operating leases
   
 
7.5%
 
         
Total future minimum lease payments
   
$
22