Amazon.com Inc.

(NASDAQ:AMZN) has long viewed Amazon Web Services as its biggest growth engine, but CEO Andy Jassy now believes the cloud business could become much larger than the company previously imagined.

During Amazon's second-quarter earnings call on Thursday, Jassy said AWS could eventually generate $1 trillion in annual revenue, more than doubling Amazon's earlier vision of the business as a company capable of producing "a few hundred billion dollars" in annual sales.

The comment wasn't new financial guidance.

Instead, it reflected Amazon's growing conviction that artificial intelligence is dramatically expanding the long-term cloud computing opportunity — and that AWS remains well positioned to capture it.