@MoreCoffee
Yes, it is the doctrine in all Christian communities except for a very few radical, extreme Calvinists ones.
Here's how you Catholic Catechism puts it in CCC 605:
"There is not, never has been, and never will be a single human being for whom Christ did not die." You will not find a more bold statement of Universal Atonement elsewhere; that's it. As clear as it an be.
Yes, it is distinctive from the invention of a few radical, latter-day Calvinists: the "L" of TULIP. See what CatholicAnswers says about that invention: