I've found answers on the web but also got conflicting answers from financial professionals (coworkers).
In metric, you'd use M (mega) for million, G (giga) for billion and T (tera) for trillion. The only financial specific similar abbreviation I can find is MM for million (financial notation, according to wikipedia).
What's the AP style (or equivalent) abbreviation for billion and trillion in a financial context?
Bonus: where would I find this information?