There have been many forms shared here on this topic.
It really all depends on what standard you are being audited against, and how much detail you think you need.
I'll give the best non answer answer.
I like to have two separate forms. The NCR form should list the NC and any and all identifying information about the product in question.
The CAR form should have the root cause info and CA and verification info to ensure that the CA's were effective.
A log could (should?) be kept to keep the incident together.
I have known some companies to do NC/CA on EVERYTHING, even if it's just a minor issue on a GMP audit. This seems to be overkill to me.
While it might be best practice to find out the root cause of WHY there was a buildup of dirt on a wall/junction in the warehouse, is it really worth the time and effort?
So the short answer is list what was wrong. What product and quantity was affected. What was done to determine why the product was affected. What corrective actions were put in place to ensure the NC does not happen again and how did you ensure that the CA's were effective.