Investment in Equipment and Leases, Net (Property on Operating Leases) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2023	Dec. 31, 2022
Lessor, Lease, Description [Line Items]
Property on operating leases, gross	$ 12,539	$ 12,539
Less accumulated depreciation	(6,678)	(5,996)
Property on operating leases, net	5,861	6,543
Additions, gross	0
Additions, less accumulated depreciation	(682)
Additions, net	(682)
Reclassifications or Dispositions, gross	0
Reclassifications or Dispositions, less accumulated depreciation	0
Reclassifications or Dispositions, net	0
Railroad [Member]
Lessor, Lease, Description [Line Items]
Property on operating leases, gross	1,723	1,723
Additions, gross	0
Reclassifications or Dispositions, gross	0
Mining [Member]
Lessor, Lease, Description [Line Items]
Property on operating leases, gross	2,749	2,749
Additions, gross	0
Reclassifications or Dispositions, gross	0
Construction [Member]
Lessor, Lease, Description [Line Items]
Property on operating leases, gross	3,218	3,218
Additions, gross	0
Reclassifications or Dispositions, gross	0
Aviation [Member]
Lessor, Lease, Description [Line Items]
Property on operating leases, gross	2,327	2,327
Additions, gross	0
Reclassifications or Dispositions, gross	0
Paper Processing [Member]
Lessor, Lease, Description [Line Items]
Property on operating leases, gross	1,058	1,058
Additions, gross	0
Reclassifications or Dispositions, gross	0
Materials Handling [Member]
Lessor, Lease, Description [Line Items]
Property on operating leases, gross	1,249	1,249
Additions, gross	0
Reclassifications or Dispositions, gross	0
Transportation, other [Member]
Lessor, Lease, Description [Line Items]
Property on operating leases, gross	215	$ 215
Additions, gross	0
Reclassifications or Dispositions, gross	$ 0

- Definition

The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before accumulated depreciation of physical assets used in the normal conduct of business to produce goods and services subject to or available for lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	cik0001640982_PropertyOnOperatingLeasesNet
Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Property subject to or available for operating lease accumulated depreciation, additions.

+ References

No definition available.

+ Details

Name:	cik0001640982_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciationAdditions
Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Property subject to or available for operating lease accumulated depreciation, reclassifications or dispositions.

+ References

No definition available.

+ Details

Name:	cik0001640982_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciationReclassificationsOrDispositions
Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Property subject to or available for operating lease, additions.

+ References

No definition available.

+ Details

Name:	cik0001640982_PropertySubjectToOrAvailableForOperatingLeaseAdditions
Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Property subject to or available for operating lease additions, gross.

+ References

No definition available.

+ Details

Name:	cik0001640982_PropertySubjectToOrAvailableForOperatingLeaseAdditionsGross
Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Property subject to or available for operating lease, reclassifications or dispositions.

+ References

No definition available.

+ Details

Name:	cik0001640982_PropertySubjectToOrAvailableForOperatingLeaseReclassificationsOrDispositions
Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Property subject to or available for operating lease reclassifications or dispositions, gross.

+ References

No definition available.

+ Details

Name:	cik0001640982_PropertySubjectToOrAvailableForOperatingLeaseReclassificationsOrDispositionsGross
Namespace Prefix:	cik0001640982_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=cik0001640982_MaterialHandlingEquipmentMember
Namespace Prefix:
Data Type:	na
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- Details

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