https://www.urban.org/policy-centers/cross-center-initiative... has it at $115B for 2017 with another $79B for "corrections" (which you can debate whether it's "police spending".)

I should imagine it's gone up since then?

> Considering over 240 million 911 calls are placed in a given year

But if you cut the police spending by, say, 50% and used that money instead to providing social services, mental health services, etc., how many of those 911 calls go away?