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Leases (Lease Cost) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating lease cost $ 28 $ 26 $ 25
Variable lease cost 5 4 4
Total lease cost $ 33 $ 30 $ 29