Here, you can view up to 36 months of bill charges, payment history and view/download PDFs of your bills. You can also use the Copy of Bill Self-Service Form to download a PDF of your bill. Up to 3 years of bill history is available to be requested, with a limit of 12 bills downloaded at a time. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.