Also a short clarification post in case someone wonders about that:
There are some games combined for whatever reason:
Pokemon Red/Blue/Yellow/Gold/Silver/Crystal together sold 76M copies.
Final Fantasy XIII sold 6.9M on PS3 and 360
Final Fantasy XV sold 6.8M on PS4 and XBO
Final Fantasya XIII-3 sold 3.3M on PS3 and 360
Dragon Quest XI: Echoes of an Elusive Age sold 3M on 3DS and PS4
Lightning Returns: Final Fantasy XIII sold 1.4M on PS3 and 360
Sadly Square Enix do not state a platform split for those, which I find severely disappointing.