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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Leases [Abstract]    
Operating cash flows from operating leases $ (229) $ (236)
Operating cash flows from finance leases (8) (7)
Financing cash flows from finance leases (88) (56)
Operating leases 186 208
Finance leases $ 76 $ 180