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Operating expenses - Continuing operations (Details) - employee
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number and average number of employees      
Average number of employees 61,500 60,000 59,200
Average number of temporary employees 2,100 2,500 2,500
Number of employees 61,600 61,000 57,800
UK      
Number and average number of employees      
Number of employees 41,500 41,200 40,600
USA      
Number and average number of employees      
Number of employees 300 300 300
India      
Number and average number of employees      
Number of employees 16,900 15,700 13,500
Poland      
Number and average number of employees      
Number of employees 1,500 1,500 1,400
Republic of Ireland      
Number and average number of employees      
Number of employees 400 1,400 1,200
Rest of the World      
Number and average number of employees      
Number of employees 1,000 900 800
Ulster Bank RoI      
Number and average number of employees      
Number of employees 500 2,200 2,400
Operating segment | Retail Banking      
Number and average number of employees      
Number of employees 14,300 15,100 16,000
Operating segment | Private Banking      
Number and average number of employees      
Number of employees 2,400 2,300 2,000
Operating segment | Commercial & Institutional      
Number and average number of employees      
Number of employees 12,400 12,200 11,700
Operating segment | Central items & other      
Number and average number of employees      
Number of employees 32,500 31,400 28,100
Discontinued operations | Ulster Bank RoI      
Number and average number of employees      
Number of employees 0 400 700