By Lauren Pollock 

Wal-Mart Stores Inc. has promoted Judith McKenna to be chief operating officer for its U.S. stores, succeeding Gisel Ruiz, who has been named executive vice president of the retail giant's international people division.

Ms. McKenna's appointment comes amid several personnel changes at the top of Wal-Mart's U.S. business, which makes up nearly 60% of the company's $476 billion in sales. The division has been struggling to boost sales during two straight years of declining shopper traffic.

In her new role, Ms. McKenna will lead a team of 1.3 million associates and will continue to direct Walmart's small format stores, development of new formats, expansion of services and the integration of digital commerce. She was most recently chief development officer.

Ms. McKenna joined Walmart nearly 20 years ago as part of its Asda leadership team in the U.K. and later moved to Walmart International as executive vice president of strategy and international development. She will continue to report to Walmart U.S. CEO Greg Foran.

Ms. Ruiz, meanwhile, will drive the company's international human resources strategy.

Wal-Mart said last month that its chief merchandising officer was leaving the retailer just days before the annual Black Friday shopping frenzy.

That departure was expected to allow Mr. Foran to restructure the U.S. operation as Wal-Mart tries to fix a problem that has dogged it for years: stocking products that will attract more shoppers into its stores. Wal-Mart doesn't plan to name a new chief merchant and executives in charge of food, general merchandise, apparel and several other business lines will report to directly to Mr. Foran.

A New Zealander who had never worked in the U.S., Mr. Foran assumed the top U.S. post in July. He is a veteran of Australian retail who joined Wal-Mart about three years ago and previously headed its Asian operations.

Among the changes afoot at Wal-Mart's U.S. stores, the company is slowing the expansion of its giant supercenters and moving into e-commerce and smaller-format grocery stores.

Write to Lauren Pollock at lauren.pollock@wsj.com

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