The investment would fund the chips and servers needed to burnish its core offerings, including Search, while supporting the development of AI services such as its Gemini model, CEO Sundar Pichai said at the annual conference for Google's cloud computing unit.
"The opportunity with AI is as big as it gets," he said, adding the investments would also benefit the company's enterprise customers.
"Getting advances into the hands of both consumers and enterprises is something we are really focused on."
Alphabet's shares were up more than 7% in afternoon trading amid a big upward swing in markets after U.S. President Donald Trump announced a 90-day pause on tariffs. The stock had tumbled 8% since April 2, when Trump announced his sweeping tariff plans.
Alphabet had outlined plans for its $75 billion outlay in February. The target was 29% higher than what Wall Street analysts had expected at the time.
Big Tech companies are pouring hundreds of billions of dollars to build artificial intelligence infrastructure in the country, but investors have been getting increasingly restless over the massive investments, demanding better returns.
