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Leases - Operating Lease Income and Related Depreciation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Leases [Abstract]        
Operating lease income $ 1,327   $ 2,643  
Operating lease income   $ 1,112   $ 2,159
Lessee, Lease, Description [Line Items]        
Depreciation expense   $ 852   $ 1,663
Assets subject to operating leases        
Lessee, Lease, Description [Line Items]        
Depreciation expense $ 988   $ 1,985