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Derivatives - Summary of derivatives (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | £ 78,406 | £ 78,904
Derivative financial liabilities | 72,082 | 72,395
Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 13,628,000 | 13,403,000
Derivative financial assets | 78,406 | 78,904
Derivative financial liabilities | 72,082 | 72,395
Derivatives | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,067,000 | 820,000
Derivative financial assets | 26 | 48
Derivative financial liabilities | 17 | 34
Derivatives | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 12,561,000 | 12,583,000
Derivative financial assets | 78,380 | 78,856
Derivative financial liabilities | 72,065 | 72,361
Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 10,333,000 | 10,268,000
Derivative financial assets | 37,499 | 44,563
Derivative financial liabilities | 31,532 | 38,483
Interest rate derivatives | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,066,000 | 819,000
Derivative financial assets | 20 | 48
Derivative financial liabilities | 2 | 34
Interest rate derivatives | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 9,267,000 | 9,449,000
Derivative financial assets | 37,479 | 44,515
Derivative financial liabilities | 31,530 | 38,449
Interest rate derivatives | Derivatives traded over the counter and settled through clearing counterparties |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 7,321,000 | 7,280,000
Interest rate swaps |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 7,015,000 | 6,533,000
Derivative financial assets | 28,960 | 33,807
Derivative financial liabilities | 23,138 | 27,424
Interest rate swaps | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 7,015,000 | 6,533,000
Derivative financial assets | 28,960 | 33,807
Derivative financial liabilities | 23,138 | 27,424
Interest rate options |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 2,226,000 | 2,184,000
Derivative financial assets | 8,539 | 10,756
Derivative financial liabilities | 8,394 | 11,059
Interest rate options | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 736,000 | 510,000
Derivative financial assets | 20 | 48
Derivative financial liabilities | 2 | 34
Interest rate options | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,490,000 | 1,674,000
Derivative financial assets | 8,519 | 10,708
Derivative financial liabilities | 8,392 | 11,025
Interest rate forwards and futures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,092,000 | 1,551,000
Interest rate forwards and futures | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 330,000 | 309,000
Interest rate forwards and futures | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 762,000 | 1,242,000
Exchange rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 3,279,000 | 3,120,000
Derivative financial assets | 40,797 | 34,161
Derivative financial liabilities | 40,306 | 33,586
Exchange rate derivatives | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,000 | 1,000
Derivative financial assets | 6 |
Derivative financial liabilities | 15 |
Exchange rate derivatives | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 3,278,000 | 3,119,000
Derivative financial assets | 40,791 | 34,161
Derivative financial liabilities | 40,291 | 33,586
Currency swaps |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 454,000 | 449,000
Derivative financial assets | 8,450 | 8,173
Derivative financial liabilities | 8,195 | 7,370
Currency swaps | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 454,000 | 449,000
Derivative financial assets | 8,450 | 8,173
Derivative financial liabilities | 8,195 | 7,370
Exchange rate option contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 852,000 | 675,000
Derivative financial assets | 5,391 | 4,181
Derivative financial liabilities | 5,576 | 4,197
Exchange rate option contracts | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,000 | 1,000
Derivative financial assets | 6 |
Derivative financial liabilities | 15 |
Exchange rate option contracts | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 851,000 | 674,000
Derivative financial assets | 5,385 | 4,181
Derivative financial liabilities | 5,561 | 4,197
Exchange rate spots, forwards and futures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,973,000 | 1,996,000
Derivative financial assets | 26,956 | 21,807
Derivative financial liabilities | 26,535 | 22,019
Exchange rate spots, forwards and futures | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,973,000 | 1,996,000
Derivative financial assets | 26,956 | 21,807
Derivative financial liabilities | 26,535 | 22,019
Credit derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 14,000 | 15,000
Derivative financial assets | 110 | 180
Derivative financial liabilities | 244 | 326
Credit derivatives | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 14,000 | 15,000
Derivative financial assets | 110 | 180
Derivative financial liabilities | 244 | £ 326
Equity and commodity derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 2,000 |
Equity and commodity derivatives | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | £ 2,000 |

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