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Financial Instruments - maturity analysis - Contractual Maturity (Details) - GBP (£) £ in Millions | 12 Months Ended |
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Dec. 31, 2024 | Dec. 31, 2023
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 | Total maturing assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | £ 166,973 | £ 173,891
0-3 months | Cash and balances at central banks |  |
Financial instruments |  |
Undiscounted cash flows, assets | 92,994 | 104,262
0-3 months | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 17 | 31
0-3 months | Settlement balances |  |
Financial instruments |  |
Undiscounted cash flows, assets | 2,085 | 7,231
0-3 months | Other financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 7,068 | 4,897
0-3 months | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 27 | 61
0-3 months | Total maturing liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 427,107 | 420,846
0-3 months | Bank deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 16,914 | 8,334
0-3 months | Customer deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 396,703 | 393,363
0-3 months | Settlement balances |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 1,729 | 6,645
0-3 months | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 63 | 71
0-3 months | Other financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 8,305 | 9,094
0-3 months | Subordinated liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 53 | 72
0-3 months | Notes in circulation |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 3,316 | 3,237
0-3 months | Lease liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 24 | 30
0-3 months | Guarantees and Commitments |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 136,018 | 127,623
0-3 months | Guarantees |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 3,060 | 2,833
0-3 months | Commitments |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 132,958 | 124,790
3-12 months | Total maturing assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 66,130 | 55,358
3-12 months | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 66 | 29
3-12 months | Other financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 9,414 | 6,756
3-12 months | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 89 | 242
3-12 months | Total maturing liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 54,744 | 46,919
3-12 months | Bank deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 5,315 | 1,279
3-12 months | Customer deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 34,316 | 31,900
3-12 months | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 343 | 175
3-12 months | Other financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 13,501 | 12,319
3-12 months | Subordinated liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 1,201 | 1,167
3-12 months | Lease liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 68 | 79
1-3 years | Total maturing assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 101,257 | 94,635
1-3 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 107 | 128
1-3 years | Other financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 17,417 | 12,304
1-3 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 126 | 735
1-3 years | Total maturing liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 38,275 | 34,215
1-3 years | Bank deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 10,114 | 6,069
1-3 years | Customer deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 2,713 | 6,464
1-3 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 335 | 366
1-3 years | Other financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 22,869 | 18,843
1-3 years | Subordinated liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 2,059 | 2,301
1-3 years | Lease liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 185 | 172
3-5 years | Total maturing assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 75,675 | 73,455
3-5 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 61 | 104
3-5 years | Other financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 11,643 | 11,183
3-5 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 105 | 401
3-5 years | Total maturing liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 18,807 | 23,951
3-5 years | Bank deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 81 | 8,307
3-5 years | Customer deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 82 | 11
3-5 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 271 | 192
3-5 years | Other financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 15,350 | 13,818
3-5 years | Subordinated liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 2,927 | 1,512
3-5 years | Lease liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 96 | 111
5-10 years | Total maturing assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 111,963 | 107,301
5-10 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 53 | 49
5-10 years | Other financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 11,843 | 10,019
5-10 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 207 | 656
5-10 years | Total maturing liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 5,754 | 6,456
5-10 years | Bank deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 79 |
5-10 years | Customer deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities |  | 14
5-10 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 43 | 92
5-10 years | Other financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 4,710 | 4,769
5-10 years | Subordinated liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 754 | 1,406
5-10 years | Lease liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 168 | 175
10-20 years | Total maturing assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 131,998 | 123,277
10-20 years | Derivative held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, assets | 76 | 49
10-20 years | Other financial assets |  |
Financial instruments |  |
Undiscounted cash flows, assets | 7,493 | 8,063
10-20 years | Finance lease |  |
Financial instruments |  |
Undiscounted cash flows, assets | 325 | 359
10-20 years | Total maturing liabilities |  |
Financial instruments |  |
Undiscounted cash flows, liabilities | 1,444 | 847
10-20 years | Customer deposits |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 14 | 19
10-20 years | Derivatives held for hedging |  |
Financial instruments |  |
Undiscounted cash flows, derivative financial liabilities | 2 | 8
10-20 years | Other financial liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 987 | 346
10-20 years | Subordinated liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 339 | 342
10-20 years | Lease liabilities |  |
Financial instruments |  |
Undiscounted cash flows, non-derivative financial liabilities | 102 | 132
Held-for-trading |  |
Financial instruments |  |
Financial Liabilities | 126,300 | 125,800
MVFTPL |  |
Financial instruments |  |
Financial Assets | 128,000 | 125,100
Financial assets at amortised cost | 0-3 months | Loans to banks - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 5,080 | 5,234
Financial assets at amortised cost | 0-3 months | Loans to customers - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 59,702 | 52,175
Financial assets at amortised cost | 3-12 months | Loans to banks - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 297 | 1,437
Financial assets at amortised cost | 3-12 months | Loans to customers - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 56,264 | 46,894
Financial assets at amortised cost | 1-3 years | Loans to banks - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 612 | 23
Financial assets at amortised cost | 1-3 years | Loans to customers - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 82,995 | 81,445
Financial assets at amortised cost | 3-5 years | Loans to banks - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 9 | 302
Financial assets at amortised cost | 3-5 years | Loans to customers - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 63,857 | 61,465
Financial assets at amortised cost | 5-10 years | Loans to banks - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 23 |
Financial assets at amortised cost | 5-10 years | Loans to customers - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 99,837 | 96,577
Financial assets at amortised cost | 10-20 years | Loans to banks - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | 158 |
Financial assets at amortised cost | 10-20 years | Loans to customers - amortised cost |  |
Financial instruments |  |
Undiscounted cash flows, assets | £ 123,946 | £ 114,806

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