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Leases (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Lessee, Lease, Description [Line Items]        
Leases, Renewal Term     5 years  
Operating lease cost $ 1 $ 1 $ 2 $ 2
Operating lease, impairment loss   $ 11   $ 11
Maximum [Member]        
Lessee, Lease, Description [Line Items]        
Leases, Remaining Lease Term Years     12 years  
Minimum [Member]        
Lessee, Lease, Description [Line Items]        
Leases, Remaining Lease Term Years     1 year