YouTube, Google's popular video website, will continue to report directly to Page.
Google's core search and advertising units generate the bulk of the company's revenue.
India-born Pichai joined Google in 2004. He is expected to continue to lead Google's Android and Chrome software operating systems as well as Google's Apps business.
The consolidation of divisions under one leader could help Google unify its business across the board rather than have Android, Chrome, and the rest operate as individual entities.