Reset iCloud password to delete an account on all devices

You can do it one by one. Read this document to learn how to sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac --> Sign out of iCloud on your devices - Apple Support

Read this support article for how to check your Apple ID device list to see where you‘re signed in --> Check your Apple Account device list to find where you’re signed in - Apple Support

- "Permanently remove a device from your account page

If you're still signed in with your Apple ID on the device, it might reappear on your account page the next time your device connects to the Internet. To permanently remove the device from your account page, sign out of iCloud, iTunes & App Stores, iMessage, FaceTime, and Game Center on that device, or erase that device." How to factory reset your iPhone, iPad, or iPod touch - Apple Support

Knowing more about your objective in doing this would mean we wouldn't end up having to document every single way to achieve an unknown goal.

If you mean your Apple ID account you must log out on each device, and you will need the account password to override Activation Lock. If this is not what you meant please explain.