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Leases - Lease costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease Cost      
Operating lease cost $ 58 $ 58 $ 55
Variable operating lease cost 26 29 24
Short term lease cost 4 4 3
Lease cost $ 88 $ 91 $ 82