Activision says it has set aside $500 million (£296m) to develop, manufacture and promote the Destiny series.
The remarkable figure was revealed by Activision chief executive Bobby Kotick at the Milken conference in LA, Reuters reports.
"If you're making a $500 million bet you can't take that chance with someone else's IP," Kotick reportedly said. "The stakes for us are getting bigger."
A spokesperson for Activision later confirmed the $500 million figure was accurate, but stressed that it included marketing, packaging, infrastructure support, royalties and other costs. It is not clear how many games in the series the investment covers.
"Bungie's very ambitious plan is designed to unfold over a ten-year period" an Activision spokesperson explained. "The depth of creative content, scope and scale is unprecedented and is required to bring Bungie's vision to life."
The Reuters report added that some of the $500 million has been spent on a new engine and a "robust backend infrastructure", which it noted "are upfront expenditures that should reduce future product development costs".
Activision has confirmed a worldwide Destiny release date of September 9 on PS3, PS4, Xbox 360 and Xbox One.