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App Store and Apple Music are probably the biggest contributors here.

Apple Pay is also becoming an increasingly notable part of that too I believe.

Are they still taking a cut per transaction? I remember they had an arrangement like that with some banks before (but banks weren't happy about it).

iCloud, iTunes, storage etc I think.

It's been mentioned that what Google pays apple to keep Google as the default search in Safari is included in this figure.

Not sure what percentage that is, but I've seen it mentioned several times. Not sure about what else is included.

Seems like support contracts would also count

Apple doesn't really do B2B in any major fashion that doesn't involve their core product lines. So answer to your question is no.

Google pays Apple for being the default search engine.

The last time I heard that number leak (admittedly been a while), that was "only" in the single digit billions per year. The services category did $8.5B in the past quarter.

Actually Apple does via the IBM partnership. For example:

https://en.wikipedia.org/wiki/IBM_Mobile

iTunes and App store - mostly the 30% IAP tax they take from developers I'd imagine.