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Leases - Lease payments not included in lease liability (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about leases for lessee [abstract]    
Short term lease expense $ 342 $ 435
Variable lease payments 0  
Lease revenue 252 264
Repayments received related to finance subleases 29 34
Total finance sublease receivables $ 38 $ 54