Keep in mind that deleting an Apple ID and iCloud account from a Mac may result in unintended consequences, including loss of data, loss of Contacts syncing, loss of Notes syncing, an inability to use apps purchased or downloaded with a different Apple ID, an inability to access music purchased with a different Apple ID, and much more — if you log out of the Apple ID associated with all of that, then none of that data will be accessible on the Mac unless that Apple ID is used again. Note that failure to do so may result in permanent data loss. But you probably would want to remove the computer from the Apple ID account as instructed. That would be another situation where deleting an Apple ID from a computer could be reasonable, but otherwise this is something you should not take lightly. With that in mind, you will want your own unique Apple ID for your own personal use, as they are not intended to be shared even with family, each family member, partner, spouse, etc, should have their own unique Apple ID. Any questions, comments, experiences, or thoughts about removing or deleting an Apple ID from a Mac?
How to Delete/Remove your Apple ID Completely from iPhone/iPad
Apple ID - Official Apple Support
Step 4 Analyzing All Data on Your iDevice and Begin to Erase Once you confirm the Wiping Level, it will deeply scan everything that can be erased on your device, you'll be asked to enter 'delete' to confirm the order and move on. During the erasing profess, you must keep your device connected and wait until the process is complete. After erasing, you'll get a new iDevice without any data in it. This makes all your personal and card-related information absolutely safe and hack-proof.
View and remove your associated devices in iTunes
You can't just access any part of the device or software without a verification. So once you end up forgetting that password, it will be very difficult for you to access anything on your Apple device. So if your Apple id gets locked somehow, it can get pretty grim as you lose access to every single feature on your iPhones. Here is a guide to remove the Apple id from your phone without any complications. So if your Apple ID gets locked somehow, it can get pretty grim as you lose access to every single feature on your iPhones.
View or remove your associated devices on a Mac or PC To automatically open iTunes and sign in to your Account Information page from your computer, click this link: Or follow these steps: Enter your password, then press the Return or Enter key on your keyboard, or click View Account.