I have no idea how good is my perfect pitch,
I sometimes manage to guess the note but only after singing it
cause I know my voice range very good,
which still isn't good enough tho so I hit the score like 1 of 40.
But my relative pitch is pretty good (I think
) and yes it's trained,
I still train it and will continue training it as long as my ears are working.
Speaking of listening and knowing chords without touching guitar, here is how I do it.
I always think of degrees and not of real names like C major, D minor etc,
tho I can say if tune is in key of Em if I hear guitar playing lots of open strings etc.
So I imagine that A major is the root per example and then I listen to rest of progression,
I can hear relation between chords ( not some ultra complex Jazz progression or som)
since I've spent a lot of time learning songs and solos by ear
so you just get there after a while and for most of Radio music I have no problems.
And after I'm done analizing progression I can play it in any I you want
which is now pure transposing tho, once you know it's I-V-II-bIV progression or som
it shouldn't be a problem to transpose it anywhere you want to.
It's simple training, force yourself to listen everything you play
or someone else plays, test yourself all the time,
after a while your ears will get used to relations between chords or notes
and you'll just KNOW what is it.