This article explains how to completely delete your Google account (emails, photos, etc.) and remove your Google account (i.e., disconnect it from your phone). These instructions work for desktop and mobile users, regardless of whether they're running Windows, macOS, Android, or iOS.
How to Delete Gmail and Google Accounts | SIMPLE GUIDE
To delete your Google Account using a computer or mobile web browser, follow these steps:
Open the Data & Privacy section of your Google Account. If you're not already signed in, select Sign in on that page.
Find the Your data and privacy options heading and select More options underneath.