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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2020
Text Block [Abstract]  
Operating Leases Of Lessee Disclosure
          
          
$ in millions
  
As of
September 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
 
$
29