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Financial Instruments - maturity analysis - Contractual Maturity (Details) - GBP (£) £ in Millions | Dec. 31, 2021 | Dec. 31, 2023 | 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 |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | £ 173,891 | £ 206,578
0-3 months | Cash and balances at central banks |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 104,262 | 144,832
0-3 months | Derivative held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 31 | 130
0-3 months | Settlement balances |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 7,231 | 2,572
0-3 months | Other financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 4,897 | 2,771
0-3 months | Finance lease |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 61 | 96
0-3 months | Financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, liabilities |  | 420,846 | 456,887
0-3 months | Bank deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 8,334 | 6,690
0-3 months | Customer deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 393,363 | 437,830
0-3 months | Settlement balances |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 6,645 | 2,012
0-3 months | Derivatives held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, derivative financial liabilities |  | 71 | 280
0-3 months | Other financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 9,094 | 6,720
0-3 months | Subordinated liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 72 | 96
0-3 months | Notes in circulation |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 3,237 | 3,218
0-3 months | Lease liabilities. |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 30 | 41
0-3 months | Guarantees and Commitments |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 115,627 | 121,929
0-3 months | Guarantees |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 2,820 | 3,150
0-3 months | Commitments |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 112,807 | 118,779
3-12 months | Financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 55,358 | 50,157
3-12 months | Derivative held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 29 | 345
3-12 months | Other financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 6,756 | 4,507
3-12 months | Finance lease |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 242 | 267
3-12 months | Financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, liabilities |  | 46,919 | 20,289
3-12 months | Bank deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 1,279 | 1,445
3-12 months | Customer deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 31,900 | 11,389
3-12 months | Derivatives held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, derivative financial liabilities |  | 175 | (371)
3-12 months | Other financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 12,319 | 6,640
3-12 months | Subordinated liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 1,167 | 1,073
3-12 months | Lease liabilities. |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 79 | 113
1-3 years | Financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 94,635 | 85,571
1-3 years | Derivative held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 128 | 28
1-3 years | Other financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 12,304 | 8,391
1-3 years | Finance lease |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 735 | 857
1-3 years | Financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, liabilities |  | 34,215 | 29,283
1-3 years | Bank deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 6,069 | 5,662
1-3 years | Customer deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 6,464 | 1,252
1-3 years | Derivatives held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, derivative financial liabilities |  | 366 | 586
1-3 years | Other financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 18,843 | 18,833
1-3 years | Subordinated liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 2,301 | 2,690
1-3 years | Lease liabilities. |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 172 | 260
3-5 years | Financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 73,455 | 63,774
3-5 years | Derivative held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 104 | 41
3-5 years | Other financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 11,183 | 7,835
3-5 years | Finance lease |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 401 | 482
3-5 years | Financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, liabilities |  | 23,951 | 24,817
3-5 years | Bank deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 8,307 | 8,503
3-5 years | Customer deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 11 | 2
3-5 years | Derivatives held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, derivative financial liabilities |  | 192 | 306
3-5 years | Other financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 13,818 | 13,906
3-5 years | Subordinated liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 1,512 | 1,897
3-5 years | Lease liabilities. |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 111 | 203
5-10 years | Financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 107,301 | 91,249
5-10 years | Derivative held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 49 | (44)
5-10 years | Other financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 10,019 | 5,706
5-10 years | Finance lease |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 656 | 549
5-10 years | Financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, liabilities |  | 6,456 | 9,439
5-10 years | Bank deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  |  | 89
5-10 years | Customer deposits |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 14 | 14
5-10 years | Derivatives held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, derivative financial liabilities |  | 92 | 116
5-10 years | Other financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 4,769 | 7,361
5-10 years | Subordinated liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 1,406 | 1,541
5-10 years | Lease liabilities. |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 175 | 318
10-20 years | Financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 123,277 | 102,948
10-20 years | Derivative held for hedging |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 49 | 43
10-20 years | Other financial assets |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 8,063 | 2,524
10-20 years | Finance lease |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 359 | 296
10-20 years | Financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, liabilities |  | 847 | 981
10-20 years | Customer deposits |  |  |
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 |  | 8 | 85
10-20 years | Other financial liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 346 | 294
10-20 years | Subordinated liabilities |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 342 | 328
10-20 years | Lease liabilities. |  |  |
Financial instruments |  |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 132 | 254
Held-for-trading |  |  |
Financial instruments |  |  |
Financial Liabilities |  | 125,800 | 146,700
MVFTPL |  |  |
Financial instruments |  |  |
Financial Assets |  | 125,100 | 145,800
Financial assets at amortised cost | 0-3 months | Loans to banks - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 5,234 | 5,254
Financial assets at amortised cost | 0-3 months | Loans to customers - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 52,175 | 50,923
Financial assets at amortised cost | 3-12 months | Loans to banks - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 1,437 | 1,621
Financial assets at amortised cost | 3-12 months | Loans to customers - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 46,894 | 43,417
Financial assets at amortised cost | 1-3 years | Loans to banks - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 23 | 17
Financial assets at amortised cost | 1-3 years | Loans to customers - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 81,445 | 76,278
Financial assets at amortised cost | 3-5 years | Loans to banks - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 302 | 288
Financial assets at amortised cost | 3-5 years | Loans to customers - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 61,465 | 55,128
Financial assets at amortised cost | 5-10 years | Loans to customers - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | 96,577 | 85,038
Financial assets at amortised cost | 10-20 years | Loans to customers - amortised cost |  |  |
Financial instruments |  |  |
Undiscounted cash flows, assets |  | £ 114,806 | £ 100,085

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