[Idiom] Find things under the pillow - is this an idiom?

[didagwen]

https://au.news.yahoo.com/nsw/a/28470222/nsw-hospitals-to-be-in-crisis-by-2017-ama/

I watched this news and the last paragraph:
this is a large amount of money that a state government just can't simply find under a pillow."

Is "under a pillow" an idiom?
What does it mean then?


thanks!

 

[SoothingDave]

The "Tooth Fairy" leaves money under the pillow in exchange for a child's tooth (when they are young and losing their "baby teeth.")

 

[didagwen]

Thanks for the reply.
So this implies the money comes in an easy way?
or is that just a description?

The "Tooth Fairy" leaves money under the pillow in exchange for a child's tooth (when they are young and losing their "baby teeth.")

 

[SoothingDave]

Yes, basically. It means they will not come about this money by some magic or easy way.