I am confused with the field type of currency field. In Apex developer guide it is mentioned as "Currency fields are automatically assigned the type Decimal."(https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/langCon_apex_primitives.htm#d165227e151).
And  in soap developer guide as  type double.(https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/field_types.htm#i1435541).

Anyone please provide clarification