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Leases (Lease Cost) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Leases [Abstract]      
Operating lease cost $ 35 $ 32 $ 28
Variable lease cost 6 4 5
Total lease cost $ 41 $ 36 $ 33