I got an email from appleid@id.apple.com -- is that a phising email?

Apple will always address you by your name or the name they have on file for you, not Dear Customer, Dear Client or by using your e-mail address.  The e-mail will be from @apple.com or @iTunes.com. E-mail addresses can be spoofed. You can go to Mail/View/Message/Show all Headers to see more. Apple emails won't have poor grammar/misspellings. Apple e-mails will never contain an attachment. Apple will never request personal information by email such as Social Security numbers, your Mother’s maiden name or full credit card numbers . 

The only exception to the above I have noticed is if you order something from the Apple Store (apple.com), your receipt will be addressed to Dear Apple Customer. That is a receipt for a purchase you initiated.

ASC YouTube for How to Identify Phishing 

Identifying legitimate emails from the iTunes Store.   *

Yes, that is legitimate. Important things to note are, Apple will never ask you to reply to the email. If you receive something similar to that, it's almost always a scam.

To be safe though, never click on links or attachments from any email. If you received an email to change your password, navigate directly to that website instead of clicking on the link.

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

I hope this helps!