Oil giant Royal Dutch Shell is reviewing its holdings in the largest oil field in the United States for a possible sale as the company looks to focus on its most profitable oil-and-gas assets and grow its low-carbon investments, according to sources familiar with the matter.

The sale could be for part or all of Shell's position in the U.S. Permian Basin, located mostly in Texas. The holdings could be worth as much as $10 billion, the sources said, on condition of anonymity because the talks are private.

Shell declined to comment.

(Reporting by Ron Bousso, Jessica Resnick-Ault and David French; Writing by David Gaffen; Editing by Daniel Wallis) ((david.gaffen@thomsonreuters.com; +1-646-223-6064; Reuters Messaging: david.gaffen.reuters.com@reuters.net))