According to Warren Buffett, the Kraft-Heinz separation has "disappointed" him.

Warren Buffett told CNBC on Tuesday that he is disappointed in the Kraft Heinz split that unwinds much of the blockbuster merger he masterminded a decade ago. With a 27.5% stake in the company, Berkshire Hathaway is Kraft Heinz’s largest shareholder. CNBC's Becky Quick joins 'Squawk on the Street' with the details.