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Leases (Lease Cost) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Operating lease cost $ 7 $ 6 $ 14 $ 12
Variable lease cost 1 1 2 2
Total lease cost $ 8 $ 7 $ 16 $ 14