CNBC:

Google is paying Apple billions of dollars to remain the default search engine on iPhones and iPads, Bernstein said in a note to investors on Monday.

The firm believes that Google will pay Apple about $3 billion this year, up from $1 billion just three years ago, and that Google’s licensing fees make up a large bulk of Apple’s services business.

It stands to reason that, if they are paying billions, they are making billions more.