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Leases (Lease Cost) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Leases [Abstract]        
Operating lease cost $ 9 $ 9 $ 27 $ 26
Variable lease cost 1 1 5 4
Total lease cost $ 10 $ 10 $ 32 $ 30