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Leases (Lease Expenses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating lease expense $ 65 $ 64 $ 64
Variable lease expense 15 16 19
Sublease Income (1) (1) (2)
Total lease expense $ 79 $ 79 $ 81