In my ~/.ideavimrc I set
noremap jj <Esc>
To remap "jj" to escape (to enter normal mode).
However it doesn't seem to be working? .ideavimrc is in the same location as my .vimrc and I restarted IntelliJ.
I don't believe multi key mappings work. I can't find an open ticket but thats what twitter comments suggest here https://twitter.com/ideavim/status/444201384981053441, http://youtrack.jetbrains.com/issue/VIM-518
You can also check which mappings intellij knows about by typing :noremap. Since jj shows up it probably doesn't work.