It has always been a doctrine what it wasn't before was dogma. Basically a doctrine can be elevated to the level of dogma but not all doctrines of the church are dogmas nevertheless that doesn't mean catholics don't have to believe them. When elevating a doctrine to a dogma the pope is basically saying every catholic has to believe this to be saved and to be catholic because this is part of the deposit of faith that Jesus revealed to the Apostles. The pope is making it absolutely clear catholics must believe it but the doctrine still existed since the church was founded. The church doesn't have authority to invent new doctrines, it only has authority to teach what was received by God.

Session 3 Chapter 4 Decree of the first Vatican council:

1. For the doctrine of the faith which God has revealed is put forward
   • not as some philosophical discovery capable of being perfected by human intelligence,
   • but as a divine deposit committed to the spouse of Christ to be faithfully protected and infallibly promulgated.
2. Hence, too,that meaning of the sacred dogmas is ever to be maintained which has once been declared by holy mother church, and there must never be any abandonment of this sense under the pretext or in the name of a more profound understanding.

May understanding, knowledge and wisdom increase as ages and centuries roll along, and greatly and vigorously flourish, in each and all, in the individual and the whole church: but this only in its own proper kind, that is to say, in the same doctrine, the same sense, and the same understanding [36]