Organization	3 Months Ended
Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Offering	Organization Organization Corporate Property Associates 18 – Global Incorporated, or CPA^®:18 – Global, and, together with its consolidated subsidiaries, we, us, or our, is a publicly-owned, non-listed real estate investment trust, or REIT, that invests primarily in a diversified portfolio of income-producing commercial real estate properties leased to companies and other real estate related assets, both domestically and internationally. We were formed in 2012 and are managed by W. P. Carey Inc., or WPC, through one of its subsidiaries, or collectively our Advisor. As a REIT, we are not subject to U.S. federal income taxation as long as we satisfy certain requirements, principally relating to the nature of our income and the level of our distributions, among other factors. We earn revenue primarily by leasing the properties we own to single corporate tenants, predominantly on a triple-net lease basis, which requires the tenant to pay substantially all of the costs associated with operating and maintaining the property. Revenue is subject to fluctuation due to the timing of new lease transactions, lease terminations, lease expirations, contractual rent adjustments, tenant defaults, sales of properties, and changes in foreign currency exchange rates. Substantially all of our assets and liabilities are held by CPA^®:18 Limited Partnership, or the Operating Partnership, and at March 31, 2016 we owned 99.97% of general and limited partnership interests in the Operating Partnership. The remaining interest in the Operating Partnership is held by a subsidiary of WPC. At March 31, 2016, our portfolio was comprised of full or partial ownership interests in 59 properties, the majority of which were fully-occupied and triple-net leased to 99 tenants totaling 9.5 million square feet. The remainder of our portfolio was comprised of our full or partial ownership interests in 61 self-storage properties and eight multi-family properties totaling 6.1 million square feet. We raised aggregate gross proceeds in our initial public offering of approximately $1.2 billion through April 2, 2015, which is the date we closed our offering. We operate in two reportable business segments: Net Lease and Self Storage. Our Net Lease segment includes our investments in net-leased properties, whether they are accounted for as operating or direct financing leases. Our Self Storage segment is comprised of our investments in self-storage properties. In addition, we have an All Other category that includes our multi-family investments and our investment in a note receivable (Note 13). Our reportable business segments and All Other category are the same as our reporting units.

Organization

Corporate Property Associates 18 – Global Incorporated, or CPA^®:18 – Global, and, together with its consolidated subsidiaries, we, us, or our, is a publicly-owned, non-listed real estate investment trust, or REIT, that invests primarily in a diversified portfolio of income-producing commercial real estate properties leased to companies and other real estate related assets, both domestically and internationally. We were formed in 2012 and are managed by W. P. Carey Inc., or WPC, through one of its subsidiaries, or collectively our Advisor. As a REIT, we are not subject to U.S. federal income taxation as long as we satisfy certain requirements, principally relating to the nature of our income and the level of our distributions, among other factors. We earn revenue primarily by leasing the properties we own to single corporate tenants, predominantly on a triple-net lease basis, which requires the tenant to pay substantially all of the costs associated with operating and maintaining the property. Revenue is subject to fluctuation due to the timing of new lease transactions, lease terminations, lease expirations, contractual rent adjustments, tenant defaults, sales of properties, and changes in foreign currency exchange rates.

Substantially all of our assets and liabilities are held by CPA^®:18 Limited Partnership, or the Operating Partnership, and at March 31, 2016 we owned 99.97% of general and limited partnership interests in the Operating Partnership. The remaining interest in the Operating Partnership is held by a subsidiary of WPC.

At March 31, 2016, our portfolio was comprised of full or partial ownership interests in 59 properties, the majority of which were fully-occupied and triple-net leased to 99 tenants totaling 9.5 million square feet. The remainder of our portfolio was comprised of our full or partial ownership interests in 61 self-storage properties and eight multi-family properties totaling 6.1 million square feet.

We raised aggregate gross proceeds in our initial public offering of approximately $1.2 billion through April 2, 2015, which is the date we closed our offering.

We operate in two reportable business segments: Net Lease and Self Storage. Our Net Lease segment includes our investments in net-leased properties, whether they are accounted for as operating or direct financing leases. Our Self Storage segment is comprised of our investments in self-storage properties. In addition, we have an All Other category that includes our multi-family investments and our investment in a note receivable (Note 13). Our reportable business segments and All Other category are the same as our reporting units.