Verizon has bill on PDFs going back 18 months. if one hasn't bother to download those that's on them. I have every bill on PDF since Jan 2012
No, Verizon does not keep a running total of how much you have paid since you became a customer. If you want that information, you will need to keep track of it yourself.
Log into your account, move your mouse over Bill, and then select Payment History. Scroll down to Payment History Report, select the date range, and then Generate report. Scroll to the bottom of the report to see the total of all your payments.