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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2019
Text Block [Abstract]  
Operating Leases Of Lessee Disclosure
$ in millions
 
As of
June 30, 2019
   
Balance Sheet Location
 
Right-of-use
asset
 
$
22
     
Other assets
 
Lease liability
 
$
22
     
Other liabilities
 
Weighted average remaining lease term (years)
   
8.2
     
 
Discount rate used for operating leases
   
7.5
%
   
 
Total future minimum lease payments
 
$
34