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Leases - Lease Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease, Cost [Abstract]      
Operating lease cost $ 181 $ 171 $ 163
Variable lease cost 10 10 7
Total $ 191 $ 181 $ 170