"You're able to view Google documents, spreadsheets, presentations, and drawings even when you don't have an Internet connection. You're also able to edit Google documents, presentations, and drawings offline. It's really handy when you're on an airplane or train without wireless Internet!
Here are some important things to know about using Google Docs, Sheets, and Slides when you're offline:
You'll first need to set it up. Enabling offline access is easy, and it takes just a minute. As soon as you do, all of your Google documents, spreadsheets, presentations, and drawings will be made available for offline viewing and editing. (Because of space limitations, Drive stores at most 4,000 items or 5 GB of data offline.)
Set up computers individually. If you want to enable offline access on both your laptop and desktop computers, you'll need to set it up twice — once on each computer.
It's Chrome-only. Offline access is unavailable in other browsers. But if you haven't already, give Chrome a try! Offline access is also available for Chrome OS users.
It's not currently available for all of your stuff. Check out the chart below to see what types of files you can view and edit while offline."
You can’t really work with Google Docs offline, the best you can do (at least as far as I know) is view Docs offline. To do so, you will have to (1) use the Chrome browser, and (2) install the Google Docs Chrome extension.