Equipment Under Operating Leases, Net (Schedule of Useful Lives of Assets) (Details)	6 Months Ended
	Jun. 30, 2019
Minimum [Member] \| Transportation, Rail [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	35 years
Minimum [Member] \| Marine Vessels [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	20 years
Minimum [Member] \| Manufacturing [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	10 years
Minimum [Member] \| Construction [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	7 years
Minimum [Member] \| Materials Handling [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	7 years
Minimum [Member] \| Transportation, Other [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	7 years
Maximum [Member] \| Transportation, Rail [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	50 years
Maximum [Member] \| Marine Vessels [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	30 years
Maximum [Member] \| Manufacturing [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	15 years
Maximum [Member] \| Construction [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	10 years
Maximum [Member] \| Materials Handling [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	10 years
Maximum [Member] \| Transportation, Other [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Useful Lives of lease assets	10 years

ATEL CAPITAL EQUIPMENT FUND IX LLC 10-Q