§1. In addition to the Roman Pontiff, cardinals have the faculty of hearing the confessions of the Christian faithful everywhere in the world by the law itself. Bishops likewise have this faculty and use it licitly everywhere unless the diocesan bishop has denied it in a particular case.
§2. Those who possess the faculty of hearing confessions habitually whether by virtue of office or by virtue of the grant of an ordinary of the place of incardination or of the place in which they have a domicile can exercise that faculty everywhere unless the local ordinary has denied it in a particular case, without prejudice to the prescripts of can. 974, §§2 and 3.
§3. Those who are provided with the faculty of hearing confessions by reason of office or grant of a competent superior according to the norm of cann. 968, §2 and 969, §2 possess the same faculty everywhere by the law itself as regards members and others living day and night in the house of the institute or society; they also use the faculty licitly unless some major superior has denied it in a particular case as regards his own subjects.
Source: Code of Canon Law (Vatican.va)