Leases Lessor, Lease Maturity (Details) $ in Millions	Sep. 30, 2019 USD ($)
Lessor, Lease Maturity [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Next Rolling Twelve Months	$ 876
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Two	746
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Three	585
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Rolling Year Four	411
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, Rolling Year Five	328
Sales-type and Direct Financing Leases, Lease Receivable, Lease Payments to be Received, after Rolling Year Five	1,256
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received	4,202
Lease Receivable Reconciling Items	545	[1]
Sales-type and Direct Financing Leases, Lease Receivable	3,657
Lessor, Operating Lease, Payments to be Received, Next Rolling Twelve Months	191
Lessor, Operating Lease, Payments to be Received, Rolling Year Two	155
Lessor, Operating Lease, Payments to be Received, Rolling Year Three	127
Lessor, Operating Lease, Payments to be Received, Rolling Year Four	95
Lessor, Operating Lease, Payments to be Received, Rolling Year Five	94
Lessor, Operating Lease, Payments to be Received, Thereafter	225
Lessor, Operating Lease, Payments to be Received	$ 887

[1] Primarily comprised of interest and guaranteed residual assets.