The six-issue First Wave miniseries will follow on from the Batman/Doc Savage Special one-shot which is released in November.
"Doc Savage is top of the food chain," Azzarello told Comic Book Resources. "He's the Superman.
"And Batman will be Batman. In the [one-shot] I'm doing with Phil Noto, Batman is just sort of making himself apparent and that catches Doc's eye. Doc is already established. He’s a war hero and an adventurer. And there’s a nut running around in Gotham City dressed as a Bat.
"You can't change Batman's origin. But this is Batman with guns. He was originally introduced with guns, so we're picking it up where it started."
First Wave, illustrated by Ralph Morales (Identity Crisis), will debut next year.