*digs out my 2E AD&D Complete Priest's Handbook*
Page 21, under Spheres of Influence, points to pages 33 & 34 of that edition's DMG to reference spheres of influence, of which 16 are listed: All, Animal, Astral, Charm, Combat, Creation, Divination, Elemental, Guardian, Healing, Necromantic, Plant, Protection, Summoning, Sun, and Weather. Page 22 of CPH goes on to give guidelines to sphere access based upon weapon/armor allowances; ask for more detail if needed.
I never saw a 2E game (or 1E, for that matter) where you could be a truly 'generic' priest; my experiences were with DMs requiring a specific Deity to grant access to spells, with their portfolios influencing what spheres they, and therefore you, could access. I don't find anything allowing the 3E 'worship an ideal' at a cursory glance through my 2E material on-hand, but that's a DM call.