Hasn't reported to all 3 for me, just TU and Ex, it took a couple of months before it showed up on Ex. Reporting has been spotty, my balance doesn't update regularly and several months haven't been reported at all. They also don't report credit limit, only high balance. BTW, Dell Financial uses CIT, not Citi, I have a Citibank card and it report to all 3 like clockwork, it actually started reporting before I received my card.
I have had a Dell (CIT) account for almost 2 years now and it has never shown up on any of the 3 major CRAs as of last month. Not sure why, but it's fine with me.