Financial share is: GE 60.5%; Snecma 23.5%; IHI Japan 9%; FiatAvio 7%.
(So moderately American I suppose - certainly not 100% as stated.)
Also worth noting that AF didn't just select CFM for A318,
it was them that essentially forced Airbus to offer CFM. Would have been PW6000-only if Airbus had its way.