Marriott International is planning to open more than 200 luxury and lifestyle hotels over the next several years.

The move is expected to involve more than $15bn of investment by the hotel operator’s owners and franchisees.

Marriott’s current luxury and lifestyle portfolio totals 449 hotels across eight brands.

Marriott president and CEO Arne Sorenson said, "The luxury and lifestyle category is stronger than ever and we see demand continuing to rise worldwide.

"Next generation travellers are poised to comprise more than 60% of our business over the next four years, and already represent a broad spectrum of diverse cultures and lifestyles that view travel as an important way to enrich their lives."

The company noted that its luxury and lifestyle portfolio will officially expand to nine brands following the debut of Moxy Hotels in Milan this autumn.

"The luxury and lifestyle category is stronger than ever and we see demand continuing to rise worldwide."

As part of the plan, 15 Ritz-Carlton hotels will be opened between now and year-end 2016, including in Nanjing, China; Rabat, Morocco; Cairo, Egypt; Jeddah, Saudi Arabia; Los Cabos, Mexico; Tunis, Tunisia; Haikou, China; Panama City, Panama; Bali, Indonesia and Macao.

Marriott is set to open an EDITION hotel in Miami Beach this autumn and will debut in New York City’s landmark Clock Tower building in the spring of 2015.

Future EDITION hotels are also planned for Abu Dhabi (2015), Gurgaon, India (2015), Sanya, China (2015), Bangkok (2016) and West Hollywood (2017), as well as the recently announced Times Square EDITION in New York City (2017).

JW Marriott Hotels & Resorts will debut in Italy in early 2015 on the private island of Sacca Sessola.

In addition, the brand is on target to open 23 new hotels in the next two years, growing from 64 to 87 hotels in 29 countries by the end of 2016.

Marriott is also looking to add 20 hotels to the Autograph Collection this year.