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