Toyota will devote a majority of the new investment to improving manufacturing plants, spokeswoman Amanda Sawyer Roark said in an email to AFP. "This investment also includes our new headquarters in Plano and research into autonomous vehicles and robotics," she said.
The company declined to say whether the investments would lead to the creation of new jobs, a key mantra of the incoming US president, who has repeatedly targeted automakers with his tweets.
Toyota, the world's largest automaker, employs 40,000 people in the United States, of which 5,000 were hired in the last five years.
Last Thursday, Trump tweeted about Toyota's Mexico plans, saying, in part: "NO WAY! Build plant in US or pay big border tax."
Like other companies Trump has attacked on Twitter, the threat worried the Japanese auto industry, and Toyota's share price fell on the Tokyo Stock Exchange.