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Leases (Lease Cost) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Leases [Abstract]        
Operating lease cost $ 8 $ 8 $ 25 $ 23
Variable lease cost 1 1 4 3
Total lease cost $ 9 $ 9 $ 29 $ 26