Why do I have negative liabilities when everything I own is paid off?

If you are married your spouse may have brought debt into the marriage

I am worth 41 million I inherited 50 million originally from my mother who was with over 100 million I think the reason why people have liabilities even though everything's paid off is because of maybe spousal support but at the same time I have over 2 million and negative liabilities put everything's paid off so can somebody tell me why