A document detailing...

"The political declaration is being upgraded potentially to include further UK commitments on workers’ rights, and a document detailing the context in which a technological fix for the Irish border could supersede the all-UK customs union envisaged in the backstop is being worked upon."

(The Guardian.)

Is a document detailing the context in which a technological fix for the Irish border could supersede the all-UK customs union envisaged in the backstop a noun phrase in the sentence above?