The proposed penalty is for a data breach beginning in 2014 that affected more than 500 million customers worldwide. It comes on the heels of a record 183 million (US$229 million) fine levied against British Airways for a breach of payment information of more than a half-million customers. According to the ICO, Marriott has cooperated with the investigation and will have a chance to present information to the Office regarding the potential fine. After hearing from Marriott and other interested parties, the ICO will decide on the final amount of the fine.”]
Source: https://www.darkreading.com/attacks-breaches/marriott-faces-124-million-gdpr-fine-in-uk