Christus Dominus §8

⁸ (a) To bishops, as successors of the Apostles, in the dioceses entrusted to them, there belongs per se all the ordinary, proper, and immediate authority which is required for the exercise of their pastoral office. But this never in any way infringes upon the power which the Roman pontiff has, by virtue of his office, of reserving cases to himself or to some other authority. (b) The general law of the Church grants the faculty to each diocesan bishop to dispense, in a particular case, the faithful over whom they legally exercise authority as often as they judge that it contributes to their spiritual welfare, except in those cases which have been especially reserved by the supreme authority of the Church.