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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2022
Text Block [Abstract]  
Operating Leases Of Lessee Disclosure
                                   
$ in millions
  
As of
March 31, 2022
    
Balance Sheet Location
 
Right-of-use
asset
  
$
18
 
  
 
Other assets
 
Lease liability
  
$
18
 
  
 
Other liabilities
 
Weighted average remaining lease term (years)
  
 
7.4
 
        
Discount rate used for operating leases
  
 
7.5%
 
        
Total future minimum lease payments
  
$
25