Cravath, Swaine & Moore, Skadden, Arps, Slate, Meagher & Flom and Gibson, Dunn & Crutcher are advising as Westin owner Starwood Hotels & Resorts Worldwide has called off its $12.2bn buyout agreement with Marriott in favour of a $13.2bn offer from a group of investors led by China’s Anbang Insurance Group.