Brad, 47, also hinted that he might find a new role behind the camera (in three years — when he turns 50).
Asked by Aussie chat show 60 Minutes how long he planned to carry on, the Fight Club star said: "Three years."
Looking to the future, he added: "I've really enjoyed the producerial side."
Brad also revealed he and wife Angelina Jolie have not decided whether they will add to their six children.
The Jolie-Pitt clan have spent the week in Vietnam visiting the native country of one of their adopted children, Pax.
Brad was speaking in Tokyo while promoting his new movie, Moneyball.