According to Bloomberg Law, Google attorney John Schmidtlein "visibly cringed" when Murphy revealed the confidential information, which Google had initially claimed needed to be kept secret because otherwise it "would unreasonably undermine Google's competitive standing in relation to both competitors and other counterparties."

For the DOJ—which has made the Google-Apple deal the center of its case alleging that Google maintains an illegal monopoly over search—this detail confirms how valuable default placements on iPhones are to the search leader.

The DOJ has argued that Google pays so much for default search deals to block out competitors, lock search users into its services, and maintain a stronghold over the search industry—a dominant position that could be further entrenched by Google's advances with AI, Microsoft CEO Satya Nadella testified. In September, an Apple exec testified that the default deal between Google and Apple was seemingly so lucrative that it even stopped Apple from creating its own rival search engine.