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Leases - Lease payments not included in lease liability (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about leases for lessee [abstract]    
Short term lease expense $ 160 $ 342
Lease revenue 272 252
Repayments received related to finance subleases 4 29
Total finance sublease receivables $ 104 $ 38