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Credit quality of loans and advances to banks and customers (Details) - GBP (£)
£ in Millions
Jun. 30, 2019
Dec. 31, 2018
Internal credit ratings systems    
Loans and advances to customers £ 495,138 £ 484,858
Retail Unsecured [Member] | RMS 10 | Minimum    
Internal credit ratings systems    
Expected credit loss PD (as a percent)   14.01%
Loans and Advances to Banks [Member] | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 8,185 £ 6,180
Loans and advances, gross carrying amount, expected credit losses £ 2 £ 2
Loans and Advances to Banks [Member] | CMS 1-10 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.00% 0.00%
Expected credit loss PD (as a percent) 0.00% 0.00%
Loans and Advances to Banks [Member] | CMS 1-10 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.50% 0.50%
Expected credit loss PD (as a percent) 0.50% 0.50%
Loans and Advances to Banks [Member] | CMS 11-14    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 192 £ 105
Loans and advances, gross carrying amount, expected credit losses £ 1  
Loans and Advances to Banks [Member] | CMS 11-14 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.51%  
Expected credit loss PD (as a percent) 0.51%  
Loans and Advances to Banks [Member] | CMS 11-14 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 3.00% 3.00%
Expected credit loss PD (as a percent) 3.00% 3.00%
Loans and Advances to Banks [Member] | CMS 15-18 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 3.01% 3.01%
Expected credit loss PD (as a percent) 3.01% 3.01%
Loans and Advances to Banks [Member] | CMS 15-18 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.00% 20.00%
Expected credit loss PD (as a percent) 20.00% 20.00%
Loans and Advances to Banks [Member] | CMS 19 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.01% 20.01%
Expected credit loss PD (as a percent) 20.01% 20.01%
Loans and Advances to Banks [Member] | CMS 19 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 99.99% 99.99%
Expected credit loss PD (as a percent) 99.99% 99.99%
Loans and Advances to Banks [Member] | CMS 20-23    
Internal credit ratings systems    
Regulatory PD (as a percent) 100.00% 100.00%
Expected credit loss PD (as a percent) 100.00%  
Loans and Advances to Banks [Member] | CMS 20-23 | Maximum    
Internal credit ratings systems    
Expected credit loss PD (as a percent)   100.00%
Loans and Advances to Banks [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 8,377 £ 6,285
Loans and advances, gross carrying amount, expected credit losses 3  
Loans and Advances to Banks [Member] | Stage 1 | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 8,170 6,177
Loans and advances, gross carrying amount, expected credit losses 2 2
Loans and Advances to Banks [Member] | Stage 1 | CMS 11-14    
Internal credit ratings systems    
Loans and advances, gross carrying amount 192 105
Loans and advances, gross carrying amount, expected credit losses 1  
Loans and Advances to Banks [Member] | Stage 1 | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 8,362 6,282
Loans and advances, gross carrying amount, expected credit losses 3  
Loans and Advances to Banks [Member] | Stage 2 | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 15 3
Loans and Advances to Banks [Member] | Stage 2 | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 15 3
Loans and Advances to Banks [Member] | Stage 3 | Retail - Mortgages [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount, expected credit losses   2
Loans and advances to customers [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 498,451 488,008
Loans and advances, gross carrying amount, expected credit losses 3,313 3,150
Loans and advances to customers £ 495,138 £ 484,858
Loans and advances to customers [Member] | CMS 11-14 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.51%  
Expected credit loss PD (as a percent)   0.51%
Loans and advances to customers [Member] | Retail Segment [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 339,978 £ 341,682
Loans and advances, gross carrying amount, expected credit losses 1,880 1,613
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 265,823 268,524
Loans and advances, gross carrying amount, expected credit losses £ 205 £ 178
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 1-6 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.00% 0.00%
Expected credit loss PD (as a percent) 0.00% 0.00%
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 1-6 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.50% 4.50%
Expected credit loss PD (as a percent) 4.50% 4.50%
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 1,864 £ 1,766
Loans and advances, gross carrying amount, expected credit losses £ 36 £ 34
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 7-9 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.51% 4.51%
Expected credit loss PD (as a percent) 4.51% 4.51%
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 7-9 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.00% 14.00%
Expected credit loss PD (as a percent) 14.00% 14.00%
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 10    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 421 £ 262
Loans and advances, gross carrying amount, expected credit losses £ 15 £ 9
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 10 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.01% 14.01%
Expected credit loss PD (as a percent) 14.01% 14.01%
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 10 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.00% 20.00%
Expected credit loss PD (as a percent) 20.00% 20.00%
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 1,028 £ 899
Loans and advances, gross carrying amount, expected credit losses £ 47 £ 42
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 11-13 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.01% 20.01%
Expected credit loss PD (as a percent) 20.01% 20.01%
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 11-13 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 99.99% 99.99%
Expected credit loss PD (as a percent) 99.99% 99.99%
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS 14    
Internal credit ratings systems    
Regulatory PD (as a percent) 100.00% 100.00%
Expected credit loss PD (as a percent) 100.00% 100.00%
Loans and advances, gross carrying amount £ 16,157 £ 16,784
Loans and advances, gross carrying amount, expected credit losses 315 196
Loans and advances to customers [Member] | Retail - Mortgages [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 285,293 288,235
Loans and advances, gross carrying amount, expected credit losses 618 459
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 23,962 23,442
Loans and advances, gross carrying amount, expected credit losses £ 232 £ 180
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 1-6 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.00% 0.00%
Expected credit loss PD (as a percent) 0.00% 0.00%
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 1-6 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.50% 4.50%
Expected credit loss PD (as a percent) 4.50% 4.50%
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 2,520 £ 2,845
Loans and advances, gross carrying amount, expected credit losses £ 146 £ 140
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 7-9 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.51% 4.51%
Expected credit loss PD (as a percent) 4.51% 4.51%
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 7-9 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.00% 14.00%
Expected credit loss PD (as a percent) 14.00% 14.00%
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 10    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 179 £ 239
Loans and advances, gross carrying amount, expected credit losses £ 30 £ 33
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 10 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.01% 14.01%
Expected credit loss PD (as a percent) 14.01%  
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 10 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.00% 20.00%
Expected credit loss PD (as a percent) 20.00% 20.00%
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 556 £ 886
Loans and advances, gross carrying amount, expected credit losses £ 183 £ 175
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 11-13 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.01% 20.01%
Expected credit loss PD (as a percent) 20.01% 20.01%
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 11-13 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 99.99% 99.99%
Expected credit loss PD (as a percent) 99.99% 99.99%
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS 14    
Internal credit ratings systems    
Regulatory PD (as a percent) 100.00% 100.00%
Expected credit loss PD (as a percent) 100.00% 100.00%
Loans and advances, gross carrying amount £ 678 £ 703
Loans and advances, gross carrying amount, expected credit losses 215 228
Loans and advances to customers [Member] | Retail Unsecured [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 27,895 28,115
Loans and advances, gross carrying amount, expected credit losses 806 756
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 14,894 13,872
Loans and advances, gross carrying amount, expected credit losses £ 206 £ 133
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 1-6 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.00% 0.00%
Expected credit loss PD (as a percent) 0.00% 0.00%
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 1-6 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.50% 4.50%
Expected credit loss PD (as a percent) 4.50% 4.50%
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 563 £ 619
Loans and advances, gross carrying amount, expected credit losses £ 24 £ 21
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 7-9 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.51% 4.51%
Expected credit loss PD (as a percent) 4.51% 4.51%
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 7-9 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.00% 14.00%
Expected credit loss PD (as a percent) 14.00% 14.00%
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 10    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 93 £ 111
Loans and advances, gross carrying amount, expected credit losses £ 9 £ 11
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 10 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.01% 14.01%
Expected credit loss PD (as a percent) 14.01%  
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 10 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.00% 20.00%
Expected credit loss PD (as a percent) 20.00% 20.00%
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 195 £ 202
Loans and advances, gross carrying amount, expected credit losses £ 31 £ 35
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 11-13 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.01% 20.01%
Expected credit loss PD (as a percent) 20.01% 20.01%
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 11-13 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 99.99% 99.99%
Expected credit loss PD (as a percent) 99.99% 99.99%
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS 14    
Internal credit ratings systems    
Regulatory PD (as a percent) 100.00% 100.00%
Expected credit loss PD (as a percent) 100.00% 100.00%
Loans and advances, gross carrying amount £ 137 £ 129
Loans and advances, gross carrying amount, expected credit losses 77 78
Loans and advances to customers [Member] | Retail UK Motor Finance [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 15,882 14,933
Loans and advances, gross carrying amount, expected credit losses 347 278
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,813 1,836
Loans and advances, gross carrying amount, expected credit losses £ 39 £ 37
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 1-10 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.00% 0.00%
Expected credit loss PD (as a percent) 0.00% 0.00%
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 1-10 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.50% 0.50%
Expected credit loss PD (as a percent) 0.50% 0.50%
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 11-14    
Internal credit ratings systems    
Loans and advances, gross carrying amount   £ 6
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 11-14 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.51% 0.51%
Expected credit loss PD (as a percent) 0.51% 0.51%
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 11-14 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 3.00% 3.00%
Expected credit loss PD (as a percent) 3.00% 3.00%
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 15-18 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 3.01% 3.01%
Expected credit loss PD (as a percent) 3.01% 3.01%
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 15-18 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.00% 20.00%
Expected credit loss PD (as a percent) 20.00% 20.00%
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 19 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.01% 20.01%
Expected credit loss PD (as a percent) 20.01% 20.01%
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 19 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 99.99% 99.99%
Expected credit loss PD (as a percent) 99.99% 99.99%
Loans and advances to customers [Member] | Retail - Other [Member] | CMS 20-23    
Internal credit ratings systems    
Regulatory PD (as a percent) 100.00% 100.00%
Expected credit loss PD (as a percent) 100.00% 100.00%
Loans and advances, gross carrying amount £ 29 £ 29
Loans and advances, gross carrying amount, expected credit losses 6 7
Loans and advances to customers [Member] | Retail - Other [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,842 1,871
Loans and advances, gross carrying amount, expected credit losses 45 44
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 8,622 7,901
Loans and advances, gross carrying amount, expected credit losses £ 14 £ 18
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 1-6 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.00% 0.00%
Expected credit loss PD (as a percent) 0.00% 0.00%
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 1-6 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.50% 4.50%
Expected credit loss PD (as a percent) 4.50% 4.50%
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 107 £ 250
Loans and advances, gross carrying amount, expected credit losses £ 3 £ 4
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 7-9 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.51% 4.51%
Expected credit loss PD (as a percent) 4.51% 4.51%
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 7-9 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.00% 14.00%
Expected credit loss PD (as a percent) 14.00% 14.00%
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 10    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 10 £ 7
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 10 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.01% 14.01%
Expected credit loss PD (as a percent) 14.01% 14.01%
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 10 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.00% 20.00%
Expected credit loss PD (as a percent) 20.00% 20.00%
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 195 £ 234
Loans and advances, gross carrying amount, expected credit losses £ 1 £ 1
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 11-13 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.01% 20.01%
Expected credit loss PD (as a percent) 20.01% 20.01%
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 11-13 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent)   99.99%
Expected credit loss PD (as a percent) 99.99% 99.99%
Loans and advances to customers [Member] | Retail - Other [Member] | RMS 14    
Internal credit ratings systems    
Regulatory PD (as a percent)   100.00%
Expected credit loss PD (as a percent) 100.00% 100.00%
Loans and advances, gross carrying amount £ 132 £ 136
Loans and advances, gross carrying amount, expected credit losses 46 53
Loans and advances to customers [Member] | Retail - Other [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 9,066 8,528
Loans and advances, gross carrying amount, expected credit losses 64 76
Loans and advances to customers [Member] | Commercial [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 101,523 101,824
Loans and advances, gross carrying amount, expected credit losses 1,384 £ 1,449
Loans and advances to customers [Member] | Commercial [Member] | Minimum    
Internal credit ratings systems    
Expected credit loss PD (as a percent)   0.00%
Loans and advances to customers [Member] | Commercial [Member] | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 68,495 £ 65,189
Loans and advances, gross carrying amount, expected credit losses £ 36 £ 33
Loans and advances to customers [Member] | Commercial [Member] | CMS 1-10 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.00% 0.00%
Expected credit loss PD (as a percent) 0.00%  
Loans and advances to customers [Member] | Commercial [Member] | CMS 1-10 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.50% 0.50%
Expected credit loss PD (as a percent) 0.50% 0.50%
Loans and advances to customers [Member] | Commercial [Member] | CMS 11-14    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 26,245 £ 28,922
Loans and advances, gross carrying amount, expected credit losses £ 156 £ 136
Loans and advances to customers [Member] | Commercial [Member] | CMS 11-14 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.51% 0.51%
Expected credit loss PD (as a percent) 0.51% 0.51%
Loans and advances to customers [Member] | Commercial [Member] | CMS 11-14 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 3.00% 3.00%
Expected credit loss PD (as a percent) 3.00% 3.00%
Loans and advances to customers [Member] | Commercial [Member] | CMS 15-18    
Internal credit ratings systems    
Expected credit loss PD (as a percent)   3.01%
Loans and advances, gross carrying amount £ 2,932 £ 4,429
Loans and advances, gross carrying amount, expected credit losses £ 138 £ 242
Loans and advances to customers [Member] | Commercial [Member] | CMS 15-18 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 3.01% 3.01%
Expected credit loss PD (as a percent) 3.01%  
Loans and advances to customers [Member] | Commercial [Member] | CMS 15-18 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.00% 20.00%
Expected credit loss PD (as a percent) 20.00% 20.00%
Loans and advances to customers [Member] | Commercial [Member] | CMS 19    
Internal credit ratings systems    
Loans and advances, gross carrying amount £ 74 £ 54
Loans and advances, gross carrying amount, expected credit losses £ 8 £ 7
Loans and advances to customers [Member] | Commercial [Member] | CMS 19 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.01% 20.01%
Expected credit loss PD (as a percent) 20.01% 20.01%
Loans and advances to customers [Member] | Commercial [Member] | CMS 19 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 99.99% 99.99%
Expected credit loss PD (as a percent) 99.99% 99.99%
Loans and advances to customers [Member] | Commercial [Member] | CMS 20-23    
Internal credit ratings systems    
Regulatory PD (as a percent) 100.00% 100.00%
Expected credit loss PD (as a percent) 100.00% 100.00%
Loans and advances, gross carrying amount £ 3,777 £ 3,230
Loans and advances, gross carrying amount, expected credit losses 1,046 1,031
Loans and advances to customers [Member] | Commercial [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 101,523 101,824
Loans and advances, gross carrying amount, expected credit losses 1,384 1,449
Loans and advances to customers [Member] | Other    
Internal credit ratings systems    
Loans and advances, gross carrying amount 56,950 44,502
Loans and advances, gross carrying amount, expected credit losses 49 88
Loans and advances to customers [Member] | Other | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 55,987 £ 43,565
Loans and advances, gross carrying amount, expected credit losses £ 10  
Loans and advances to customers [Member] | Other | CMS 1-10 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.00% 0.00%
Expected credit loss PD (as a percent) 0.00% 0.00%
Loans and advances to customers [Member] | Other | CMS 1-10 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.50% 0.50%
Expected credit loss PD (as a percent) 0.50% 0.50%
Loans and advances to customers [Member] | Other | CMS 11-14    
Internal credit ratings systems    
Loans and advances, gross carrying amount   £ 6
Loans and advances, gross carrying amount, expected credit losses   £ 6
Loans and advances to customers [Member] | Other | CMS 11-14 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.51% 0.51%
Expected credit loss PD (as a percent) 0.51% 0.51%
Loans and advances to customers [Member] | Other | CMS 11-14 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 3.00% 3.00%
Expected credit loss PD (as a percent) 3.00% 3.00%
Loans and advances to customers [Member] | Other | CMS 15-18 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 3.01% 3.01%
Expected credit loss PD (as a percent) 3.01% 3.01%
Loans and advances to customers [Member] | Other | CMS 15-18 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.00% 20.00%
Expected credit loss PD (as a percent) 20.00% 20.00%
Loans and advances to customers [Member] | Other | CMS 19    
Internal credit ratings systems    
Expected credit loss PD (as a percent)   20.01%
Loans and advances to customers [Member] | Other | CMS 19 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.01%  
Expected credit loss PD (as a percent) 20.01%  
Loans and advances to customers [Member] | Other | CMS 19 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 99.99% 99.99%
Expected credit loss PD (as a percent) 99.99% 99.99%
Loans and advances to customers [Member] | Other | CMS 20-23    
Internal credit ratings systems    
Regulatory PD (as a percent) 100.00% 100.00%
Expected credit loss PD (as a percent) 100.00% 100.00%
Loans and advances, gross carrying amount £ 68 £ 66
Loans and advances, gross carrying amount, expected credit losses 23 £ 27
Loans and advances to customers [Member] | Other | CMS 20-23 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent)   20.01%
Loans and advances to customers [Member] | Other | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 56,055 £ 43,637
Loans and advances, gross carrying amount, expected credit losses 33 33
Loans and advances to customers [Member] | Other | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 839 810
Loans and advances, gross carrying amount, expected credit losses £ 5 £ 44
Loans and advances to customers [Member] | Other | RMS 1-6 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 0.00% 0.00%
Expected credit loss PD (as a percent) 0.00% 0.00%
Loans and advances to customers [Member] | Other | RMS 1-6 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.50% 4.50%
Expected credit loss PD (as a percent) 4.50% 4.50%
Loans and advances to customers [Member] | Other | RMS 7-9 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 4.51% 4.51%
Expected credit loss PD (as a percent) 4.51% 4.51%
Loans and advances to customers [Member] | Other | RMS 7-9 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.00% 14.00%
Expected credit loss PD (as a percent) 14.00% 14.00%
Loans and advances to customers [Member] | Other | RMS 10 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 14.01% 14.01%
Expected credit loss PD (as a percent) 14.01% 14.01%
Loans and advances to customers [Member] | Other | RMS 10 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.00% 20.00%
Expected credit loss PD (as a percent) 20.00% 20.00%
Loans and advances to customers [Member] | Other | RMS 11-13 | Minimum    
Internal credit ratings systems    
Regulatory PD (as a percent) 20.01% 20.01%
Expected credit loss PD (as a percent) 20.01% 20.01%
Loans and advances to customers [Member] | Other | RMS 11-13 | Maximum    
Internal credit ratings systems    
Regulatory PD (as a percent) 99.99% 99.99%
Expected credit loss PD (as a percent) 99.99% 99.99%
Loans and advances to customers [Member] | Other | RMS 14    
Internal credit ratings systems    
Regulatory PD (as a percent) 100.00% 100.00%
Expected credit loss PD (as a percent) 100.00% 100.00%
Loans and advances, gross carrying amount £ 56 £ 55
Loans and advances, gross carrying amount, expected credit losses 11 11
Loans and advances to customers [Member] | Other | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 895 865
Loans and advances, gross carrying amount, expected credit losses 16 55
Loans and advances to customers [Member] | Stage 1    
Internal credit ratings systems    
Loans and advances, gross carrying amount 448,246 441,531
Loans and advances, gross carrying amount, expected credit losses 621 525
Loans and advances to customers 447,625 441,006
Loans and advances to customers [Member] | Stage 1 | Retail Segment [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 301,138 305,160
Loans and advances, gross carrying amount, expected credit losses 524 389
Loans and advances to customers [Member] | Stage 1 | Retail - Mortgages [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 252,238 257,740
Loans and advances, gross carrying amount, expected credit losses 37 37
Loans and advances to customers [Member] | Stage 1 | Retail - Mortgages [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount 22 57
Loans and advances to customers [Member] | Stage 1 | Retail - Mortgages [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 252,260 257,797
Loans and advances, gross carrying amount, expected credit losses 37 37
Loans and advances to customers [Member] | Stage 1 | Retail Unsecured [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 22,749 22,363
Loans and advances, gross carrying amount, expected credit losses 184 135
Loans and advances to customers [Member] | Stage 1 | Retail Unsecured [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,782 2,071
Loans and advances, gross carrying amount, expected credit losses 70 57
Loans and advances to customers [Member] | Stage 1 | Retail Unsecured [Member] | RMS 10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 36 72
Loans and advances, gross carrying amount, expected credit losses 4 4
Loans and advances to customers [Member] | Stage 1 | Retail Unsecured [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount 11 199
Loans and advances, gross carrying amount, expected credit losses 3 3
Loans and advances to customers [Member] | Stage 1 | Retail Unsecured [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 24,578 24,705
Loans and advances, gross carrying amount, expected credit losses 261 199
Loans and advances to customers [Member] | Stage 1 | Retail UK Motor Finance [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 14,013 12,918
Loans and advances, gross carrying amount, expected credit losses 187 114
Loans and advances to customers [Member] | Stage 1 | Retail UK Motor Finance [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount 327 301
Loans and advances, gross carrying amount, expected credit losses 13 6
Loans and advances to customers [Member] | Stage 1 | Retail UK Motor Finance [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount 3 5
Loans and advances, gross carrying amount, expected credit losses   1
Loans and advances to customers [Member] | Stage 1 | Retail UK Motor Finance [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 14,343 13,224
Loans and advances, gross carrying amount, expected credit losses 200 121
Loans and advances to customers [Member] | Stage 1 | Retail - Other [Member] | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,538 1,605
Loans and advances, gross carrying amount, expected credit losses 20 20
Loans and advances to customers [Member] | Stage 1 | Retail - Other [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,538 1,605
Loans and advances, gross carrying amount, expected credit losses 20 20
Loans and advances to customers [Member] | Stage 1 | Retail - Other [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 8,252 7,428
Loans and advances, gross carrying amount, expected credit losses 6 10
Loans and advances to customers [Member] | Stage 1 | Retail - Other [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount   190
Loans and advances, gross carrying amount, expected credit losses   2
Loans and advances to customers [Member] | Stage 1 | Retail - Other [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount 167 211
Loans and advances to customers [Member] | Stage 1 | Retail - Other [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 8,419 7,829
Loans and advances, gross carrying amount, expected credit losses 6 12
Loans and advances to customers [Member] | Stage 1 | Commercial [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 90,333 92,002
Loans and advances, gross carrying amount, expected credit losses 84 93
Loans and advances to customers [Member] | Stage 1 | Commercial [Member] | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 68,151 65,089
Loans and advances, gross carrying amount, expected credit losses 35 32
Loans and advances to customers [Member] | Stage 1 | Commercial [Member] | CMS 11-14    
Internal credit ratings systems    
Loans and advances, gross carrying amount 21,584 25,472
Loans and advances, gross carrying amount, expected credit losses 46 50
Loans and advances to customers [Member] | Stage 1 | Commercial [Member] | CMS 15-18    
Internal credit ratings systems    
Loans and advances, gross carrying amount 598 1,441
Loans and advances, gross carrying amount, expected credit losses 3 11
Loans and advances to customers [Member] | Stage 1 | Commercial [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 90,333 92,002
Loans and advances, gross carrying amount, expected credit losses 84 93
Loans and advances to customers [Member] | Stage 1 | Other    
Internal credit ratings systems    
Loans and advances, gross carrying amount 56,775 44,369
Loans and advances, gross carrying amount, expected credit losses 13 43
Loans and advances to customers [Member] | Stage 1 | Other | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 55,986 43,565
Loans and advances, gross carrying amount, expected credit losses 9  
Loans and advances to customers [Member] | Stage 1 | Other | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 55,986 43,565
Loans and advances, gross carrying amount, expected credit losses 9  
Loans and advances to customers [Member] | Stage 1 | Other | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 789 804
Loans and advances, gross carrying amount, expected credit losses 4 43
Loans and advances to customers [Member] | Stage 1 | Other | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 789 804
Loans and advances, gross carrying amount, expected credit losses 4 43
Loans and advances to customers [Member] | Stage 2    
Internal credit ratings systems    
Loans and advances, gross carrying amount 29,171 25,345
Loans and advances, gross carrying amount, expected credit losses 953 994
Loans and advances to customers 28,218 24,351
Loans and advances to customers [Member] | Stage 2 | Retail Segment [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 21,707 18,741
Loans and advances, gross carrying amount, expected credit losses 697 662
Loans and advances to customers [Member] | Stage 2 | Retail - Mortgages [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 13,585 10,784
Loans and advances, gross carrying amount, expected credit losses 168 141
Loans and advances to customers [Member] | Stage 2 | Retail - Mortgages [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,842 1,709
Loans and advances, gross carrying amount, expected credit losses 36 34
Loans and advances to customers [Member] | Stage 2 | Retail - Mortgages [Member] | RMS 10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 421 262
Loans and advances, gross carrying amount, expected credit losses 15 9
Loans and advances to customers [Member] | Stage 2 | Retail - Mortgages [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,028 899
Loans and advances, gross carrying amount, expected credit losses 47 42
Loans and advances to customers [Member] | Stage 2 | Retail - Mortgages [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 16,876 13,654
Loans and advances, gross carrying amount, expected credit losses 266 226
Loans and advances to customers [Member] | Stage 2 | Retail Unsecured [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,213 1,079
Loans and advances, gross carrying amount, expected credit losses 48 45
Loans and advances to customers [Member] | Stage 2 | Retail Unsecured [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount 738 774
Loans and advances, gross carrying amount, expected credit losses 76 83
Loans and advances to customers [Member] | Stage 2 | Retail Unsecured [Member] | RMS 10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 143 167
Loans and advances, gross carrying amount, expected credit losses 26 29
Loans and advances to customers [Member] | Stage 2 | Retail Unsecured [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount 545 687
Loans and advances, gross carrying amount, expected credit losses 180 172
Loans and advances to customers [Member] | Stage 2 | Retail Unsecured [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 2,639 2,707
Loans and advances, gross carrying amount, expected credit losses 330 329
Loans and advances to customers [Member] | Stage 2 | Retail UK Motor Finance [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 881 954
Loans and advances, gross carrying amount, expected credit losses 19 19
Loans and advances to customers [Member] | Stage 2 | Retail UK Motor Finance [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount 236 318
Loans and advances, gross carrying amount, expected credit losses 11 15
Loans and advances to customers [Member] | Stage 2 | Retail UK Motor Finance [Member] | RMS 10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 93 111
Loans and advances, gross carrying amount, expected credit losses 9 11
Loans and advances to customers [Member] | Stage 2 | Retail UK Motor Finance [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount 192 197
Loans and advances, gross carrying amount, expected credit losses 31 34
Loans and advances to customers [Member] | Stage 2 | Retail UK Motor Finance [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,402 1,580
Loans and advances, gross carrying amount, expected credit losses 70 79
Loans and advances to customers [Member] | Stage 2 | Retail - Other [Member] | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 275 231
Loans and advances, gross carrying amount, expected credit losses 19 17
Loans and advances to customers [Member] | Stage 2 | Retail - Other [Member] | CMS 11-14    
Internal credit ratings systems    
Loans and advances, gross carrying amount   6
Loans and advances to customers [Member] | Stage 2 | Retail - Other [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 275 237
Loans and advances, gross carrying amount, expected credit losses 19 17
Loans and advances to customers [Member] | Stage 2 | Retail - Other [Member] | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 370 473
Loans and advances, gross carrying amount, expected credit losses 8 8
Loans and advances to customers [Member] | Stage 2 | Retail - Other [Member] | RMS 7-9    
Internal credit ratings systems    
Loans and advances, gross carrying amount 107 60
Loans and advances, gross carrying amount, expected credit losses 3 2
Loans and advances to customers [Member] | Stage 2 | Retail - Other [Member] | RMS 10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 10 7
Loans and advances to customers [Member] | Stage 2 | Retail - Other [Member] | RMS 11-13    
Internal credit ratings systems    
Loans and advances, gross carrying amount 28 23
Loans and advances, gross carrying amount, expected credit losses 1 1
Loans and advances to customers [Member] | Stage 2 | Retail - Other [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 515 563
Loans and advances, gross carrying amount, expected credit losses 12 11
Loans and advances to customers [Member] | Stage 2 | Commercial [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 7,413 6,592
Loans and advances, gross carrying amount, expected credit losses 254 325
Loans and advances to customers [Member] | Stage 2 | Commercial [Member] | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 344 100
Loans and advances, gross carrying amount, expected credit losses 1 1
Loans and advances to customers [Member] | Stage 2 | Commercial [Member] | CMS 11-14    
Internal credit ratings systems    
Loans and advances, gross carrying amount 4,661 3,450
Loans and advances, gross carrying amount, expected credit losses 110 86
Loans and advances to customers [Member] | Stage 2 | Commercial [Member] | CMS 15-18    
Internal credit ratings systems    
Loans and advances, gross carrying amount 2,334 2,988
Loans and advances, gross carrying amount, expected credit losses 135 231
Loans and advances to customers [Member] | Stage 2 | Commercial [Member] | CMS 19    
Internal credit ratings systems    
Loans and advances, gross carrying amount 74 54
Loans and advances, gross carrying amount, expected credit losses 8 7
Loans and advances to customers [Member] | Stage 2 | Commercial [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 7,413 6,592
Loans and advances, gross carrying amount, expected credit losses 254 325
Loans and advances to customers [Member] | Stage 2 | Other    
Internal credit ratings systems    
Loans and advances, gross carrying amount 51 12
Loans and advances, gross carrying amount, expected credit losses 2 7
Loans and advances to customers [Member] | Stage 2 | Other | CMS 1-10    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1  
Loans and advances, gross carrying amount, expected credit losses 1  
Loans and advances to customers [Member] | Stage 2 | Other | CMS 11-14    
Internal credit ratings systems    
Loans and advances, gross carrying amount   6
Loans and advances, gross carrying amount, expected credit losses   6
Loans and advances to customers [Member] | Stage 2 | Other | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1 6
Loans and advances, gross carrying amount, expected credit losses 1 6
Loans and advances to customers [Member] | Stage 2 | Other | RMS 1-6    
Internal credit ratings systems    
Loans and advances, gross carrying amount 50 6
Loans and advances, gross carrying amount, expected credit losses 1 1
Loans and advances to customers [Member] | Stage 2 | Other | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 50 6
Loans and advances, gross carrying amount, expected credit losses 1 1
Loans and advances to customers [Member] | Stage 3    
Internal credit ratings systems    
Loans and advances, gross carrying amount 6,420 5,741
Loans and advances, gross carrying amount, expected credit losses 1,558 1,553
Loans and advances to customers 4,862 4,188
Loans and advances to customers [Member] | Stage 3 | Retail Segment [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 2,519 2,390
Loans and advances, gross carrying amount, expected credit losses 478 484
Loans and advances to customers [Member] | Stage 3 | Retail - Mortgages [Member] | RMS 14    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,543 1,393
Loans and advances, gross carrying amount, expected credit losses 134 118
Loans and advances to customers [Member] | Stage 3 | Retail - Mortgages [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 1,543 1,393
Loans and advances, gross carrying amount, expected credit losses 134 118
Loans and advances to customers [Member] | Stage 3 | Retail Unsecured [Member] | RMS 14    
Internal credit ratings systems    
Loans and advances, gross carrying amount 678 703
Loans and advances, gross carrying amount, expected credit losses 215 228
Loans and advances to customers [Member] | Stage 3 | Retail Unsecured [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 678 703
Loans and advances, gross carrying amount, expected credit losses 215 228
Loans and advances to customers [Member] | Stage 3 | Retail UK Motor Finance [Member] | RMS 14    
Internal credit ratings systems    
Loans and advances, gross carrying amount 137 129
Loans and advances, gross carrying amount, expected credit losses 77 78
Loans and advances to customers [Member] | Stage 3 | Retail UK Motor Finance [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 137 129
Loans and advances, gross carrying amount, expected credit losses 77 78
Loans and advances to customers [Member] | Stage 3 | Retail - Other [Member] | CMS 20-23    
Internal credit ratings systems    
Loans and advances, gross carrying amount 29 29
Loans and advances, gross carrying amount, expected credit losses 6 7
Loans and advances to customers [Member] | Stage 3 | Retail - Other [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 29 29
Loans and advances, gross carrying amount, expected credit losses 6 7
Loans and advances to customers [Member] | Stage 3 | Retail - Other [Member] | RMS 14    
Internal credit ratings systems    
Loans and advances, gross carrying amount 132 136
Loans and advances, gross carrying amount, expected credit losses 46 53
Loans and advances to customers [Member] | Stage 3 | Retail - Other [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 132 136
Loans and advances, gross carrying amount, expected credit losses 46 53
Loans and advances to customers [Member] | Stage 3 | Commercial [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 3,777 3,230
Loans and advances, gross carrying amount, expected credit losses 1,046 1,031
Loans and advances to customers [Member] | Stage 3 | Commercial [Member] | CMS 20-23    
Internal credit ratings systems    
Loans and advances, gross carrying amount 3,777 3,230
Loans and advances, gross carrying amount, expected credit losses 1,046 1,031
Loans and advances to customers [Member] | Stage 3 | Commercial [Member] | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 3,777 3,230
Loans and advances, gross carrying amount, expected credit losses 1,046 1,031
Loans and advances to customers [Member] | Stage 3 | Other    
Internal credit ratings systems    
Loans and advances, gross carrying amount 124 121
Loans and advances, gross carrying amount, expected credit losses 34 38
Loans and advances to customers [Member] | Stage 3 | Other | CMS 20-23    
Internal credit ratings systems    
Loans and advances, gross carrying amount 68 66
Loans and advances, gross carrying amount, expected credit losses 23 27
Loans and advances to customers [Member] | Stage 3 | Other | CMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 68 66
Loans and advances, gross carrying amount, expected credit losses 23 27
Loans and advances to customers [Member] | Stage 3 | Other | RMS 14    
Internal credit ratings systems    
Loans and advances, gross carrying amount 56 55
Loans and advances, gross carrying amount, expected credit losses 11 11
Loans and advances to customers [Member] | Stage 3 | Other | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 56 55
Loans and advances, gross carrying amount, expected credit losses 11 11
Loans and advances to customers [Member] | Purchased Or Originated Credit Impairment [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 14,614 15,391
Loans and advances, gross carrying amount, expected credit losses 181 78
Loans and advances to customers 14,433 15,313
Loans and advances to customers [Member] | Purchased Or Originated Credit Impairment [Member] | Retail Segment [Member]    
Internal credit ratings systems    
Loans and advances, gross carrying amount 14,614 15,391
Loans and advances, gross carrying amount, expected credit losses 181 78
Loans and advances to customers [Member] | Purchased Or Originated Credit Impairment [Member] | Retail - Mortgages [Member] | RMS 14    
Internal credit ratings systems    
Loans and advances, gross carrying amount 14,614 15,391
Loans and advances, gross carrying amount, expected credit losses 181 78
Loans and advances to customers [Member] | Purchased Or Originated Credit Impairment [Member] | Retail - Mortgages [Member] | RMS    
Internal credit ratings systems    
Loans and advances, gross carrying amount 14,614 15,391
Loans and advances, gross carrying amount, expected credit losses £ 181 £ 78