xbrli:monetary 

the monetary type serves as the datatype for those financial 
concepts in a taxonomy which denote units in a currency.
Instance items with this type must have a unit of measure 
from the ISO 4217 namespace of currencies.

Simple Type Information

Used By

Complex Type xbrli:monetaryItemType

Source 

<simpleType name="monetary">
  <annotation>
    <documentation>the monetary type serves as the datatype for those financial concepts in a taxonomy which denote units in a currency. Instance items with this type must have a unit of measure from the ISO 4217 namespace of currencies.</documentation>
  </annotation>
  <restriction base="decimal"/>
</simpleType>