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Financial Instruments - maturity analysis - Contractual Maturity (Details) - GBP (£) £ in Millions | Dec. 31, 2021 | Dec. 31, 2022
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Financial instruments |  |
Contractual maturity period for undiscounted cash flows | 20 years |
Threshold period for principal amounts of financial liabilities to be excluded from contractual maturity for cash outflows | 20 years |
Threshold period for interest payments of financial liabilities to be excluded from contractual maturity for cash outflows | 20 years |
0-3 months | Financial assets, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | £ 255,584 | £ 206,578
0-3 months | Cash and balances at central banks |  |
Financial instruments |  |
Undiscounted cash flows, assets | 177,757 | 144,832
0-3 months | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | (23) | 130
0-3 months | Settlement balances |  |
Financial instruments |  |
Undiscounted cash flows, assets | 2,141 | 2,572
0-3 months | Loans and advances to banks [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 5,735 |
0-3 months | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 65,760 |
0-3 months | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 3,924 | 2,771
0-3 months | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 290 | 96
0-3 months | Financial liabilities, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 498,580 | 456,887
0-3 months | Deposits by banks |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 13,292 | 6,690
0-3 months | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 473,123 | 437,830
0-3 months | Settlement balances liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 2,068 | 2,012
0-3 months | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | (57) | 280
0-3 months | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 6,967 | 6,720
0-3 months | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 66 | 96
0-3 months | Notes in circulation |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 3,047 | 3,218
0-3 months | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 74 | 41
0-3 months | Guarantees and Commitments |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 120,591 | 121,929
0-3 months | Guarantees |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 2,055 | 3,150
0-3 months | Commitments |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 118,536 | 118,779
3-12 months | Financial assets, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 52,717 | 50,157
3-12 months | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | (32) | 345
3-12 months | Loans and advances to banks [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 1,689 |
3-12 months | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 43,144 |
3-12 months | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 7,576 | 4,507
3-12 months | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 340 | 267
3-12 months | Financial liabilities, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 16,888 | 20,289
3-12 months | Deposits by banks |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 421 | 1,445
3-12 months | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 5,440 | 11,389
3-12 months | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | (31) | (371)
3-12 months | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 9,293 | 6,640
3-12 months | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 1,604 | 1,073
3-12 months | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 161 | 113
More than 1 year but less than 3 years | Financial assets, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 75,285 | 85,571
More than 1 year but less than 3 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 72 | 28
More than 1 year but less than 3 years | Loans and advances to banks [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 21 |
More than 1 year but less than 3 years | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 63,979 |
More than 1 year but less than 3 years | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 10,467 | 8,391
More than 1 year but less than 3 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 746 | 857
More than 1 year but less than 3 years | Financial liabilities, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 22,936 | 29,283
More than 1 year but less than 3 years | Deposits by banks |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 566 | 5,662
More than 1 year but less than 3 years | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 1,155 | 1,252
More than 1 year but less than 3 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 561 | 586
More than 1 year but less than 3 years | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 16,953 | 18,833
More than 1 year but less than 3 years | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 3,481 | 2,690
More than 1 year but less than 3 years | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 220 | 260
More than 3 years but less than 5 years | Financial assets, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 53,624 | 63,774
More than 3 years but less than 5 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 15 | 41
More than 3 years but less than 5 years | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 45,057 |
More than 3 years but less than 5 years | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 8,048 | 7,835
More than 3 years but less than 5 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 504 | 482
More than 3 years but less than 5 years | Financial liabilities, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 24,630 | 24,817
More than 3 years but less than 5 years | Deposits by banks |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 12,003 | 8,503
More than 3 years but less than 5 years | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 73 | 2
More than 3 years but less than 5 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 155 | 306
More than 3 years but less than 5 years | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 10,062 | 13,906
More than 3 years but less than 5 years | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 2,170 | 1,897
More than 3 years but less than 5 years | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 167 | 203
5-10 years | Financial assets, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 81,202 | 91,249
5-10 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 10 | (44)
5-10 years | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 73,044 |
5-10 years | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 7,444 | 5,706
5-10 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 704 | 549
5-10 years | Financial liabilities, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 9,534 | 9,439
5-10 years | Deposits by banks |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 89
5-10 years | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 4 | 14
5-10 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | (152) | 116
5-10 years | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 7,905 | 7,361
5-10 years | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 1,496 | 1,541
5-10 years | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 281 | 318
10-20 years | Financial assets, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 96,032 | 102,948
10-20 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 17 | 43
10-20 years | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets | 90,115 |
10-20 years | Financial assets (Other) |  |
Financial instruments |  |
Undiscounted cash flows, assets | 5,523 | 2,524
10-20 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 377 | 296
10-20 years | Financial liabilities, class [member] |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 927 | 981
10-20 years | Customer accounts |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 19 | 20
10-20 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | (198) | 85
10-20 years | Financial liabilities (other) |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 292 | 294
10-20 years | Subordinated Liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 563 | 328
10-20 years | Lease liabilities. |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 251 | 254
Financial liabilities at fair value through profit or loss that meet definition of held for trading, category [member] |  |
Financial instruments |  |
Financial Liabilities | 165,300 | 146,700
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] |  |
Financial instruments |  |
Financial Assets | £ 165,600 | 145,800
Financial assets at amortised cost | 0-3 months | Loans and advances to banks [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 5,254
Financial assets at amortised cost | 0-3 months | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 50,923
Financial assets at amortised cost | 3-12 months | Loans and advances to banks [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 1,621
Financial assets at amortised cost | 3-12 months | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 43,417
Financial assets at amortised cost | More than 1 year but less than 3 years | Loans and advances to banks [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 17
Financial assets at amortised cost | More than 1 year but less than 3 years | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 76,278
Financial assets at amortised cost | More than 3 years but less than 5 years | Loans and advances to banks [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 288
Financial assets at amortised cost | More than 3 years but less than 5 years | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 55,128
Financial assets at amortised cost | 5-10 years | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | 85,038
Financial assets at amortised cost | 10-20 years | Loans and advances to customers [Member] |  |
Financial instruments |  |
Undiscounted cash flows, assets |  | £ 100,085

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