Log in to MyAccount at www.globe.com.ph/myaccount.
From the Account List page, select your Postpaid account and then click on the "Manage Account" button.
That takes you to your Account Dashboard. Scroll down slightly and you'll come across the portion showing all your current charges (highlighted below).
This shows your outstanding balance, your previous balance, your unbilled charges, and your current balance. It also shows your next payment due date.