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Derivatives - Summary of derivatives (Details) - GBP (£) £ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | £ 13,925,000
Derivative financial assets | £ 78,904 | 99,545
Derivative financial liabilities | 72,395 | 94,047
Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 709,000
Derivative financial assets |  | 113
Derivative financial liabilities |  | 33
Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 13,216,000
Derivative financial assets |  | 99,432
Derivative financial liabilities |  | 94,014
Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 13,403,000 |
Derivative financial assets | 78,904 |
Derivative financial liabilities | 72,395 |
Derivatives | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 820,000 |
Derivative financial assets | 48 |
Derivative financial liabilities | 34 |
Derivatives | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 12,583,000 |
Derivative financial assets | 78,856 |
Derivative financial liabilities | 72,361 |
Interest rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 10,268,000 | 10,742,000
Derivative financial assets | 44,563 | 53,480
Derivative financial liabilities | 38,483 | 48,535
Interest rate derivatives | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 819,000 | 707,000
Derivative financial assets | 48 | 113
Derivative financial liabilities | 34 | 33
Interest rate derivatives | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 9,449,000 | 10,035,000
Derivative financial assets | 44,515 | 53,367
Derivative financial liabilities | 38,449 | 48,502
Interest rate derivatives | Derivatives traded over the counter and settled through clearing counterparties |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 7,280,000 | 8,065,000
Interest rate swaps |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 6,533,000 | 7,201,000
Derivative financial assets | 33,807 | 39,039
Derivative financial liabilities | 27,424 | 32,992
Interest rate swaps | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 6,533,000 | 7,201,000
Derivative financial assets | 33,807 | 39,039
Derivative financial liabilities | 27,424 | 32,992
Interest rate options |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 2,184,000 | 1,714,000
Derivative financial assets | 10,756 | 14,441
Derivative financial liabilities | 11,059 | 15,543
Interest rate options | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 510,000 | 296,000
Derivative financial assets | 48 | 113
Derivative financial liabilities | 34 | 33
Interest rate options | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,674,000 | 1,418,000
Derivative financial assets | 10,708 | 14,328
Derivative financial liabilities | 11,025 | 15,510
Interest rate forwards and futures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,551,000 | 1,827,000
Interest rate forwards and futures | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 309,000 | 411,000
Interest rate forwards and futures | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,242,000 | 1,416,000
Exchange rate derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 3,120,000 | 3,168,000
Derivative financial assets | 34,161 | 45,829
Derivative financial liabilities | 33,586 | 45,237
Exchange rate derivatives | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,000 | 2,000
Exchange rate derivatives | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 3,119,000 | 3,166,000
Derivative financial assets | 34,161 | 45,829
Derivative financial liabilities | 33,586 | 45,237
Currency swaps |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 449,000 | 438,000
Derivative financial assets | 8,173 | 11,840
Derivative financial liabilities | 7,370 | 10,430
Currency swaps | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 449,000 | 438,000
Derivative financial assets | 8,173 | 11,840
Derivative financial liabilities | 7,370 | 10,430
Exchange rate option contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 675,000 | 837,000
Derivative financial assets | 4,181 | 6,375
Derivative financial liabilities | 4,197 | 6,647
Exchange rate option contracts | Derivatives traded on recognised exchange |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,000 | 2,000
Exchange rate option contracts | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 674,000 | 835,000
Derivative financial assets | 4,181 | 6,375
Derivative financial liabilities | 4,197 | 6,647
Exchange rate spots, forwards and futures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,996,000 | 1,893,000
Derivative financial assets | 21,807 | 27,614
Derivative financial liabilities | 22,019 | 28,160
Exchange rate spots, forwards and futures | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,996,000 | 1,893,000
Derivative financial assets | 21,807 | 27,614
Derivative financial liabilities | 22,019 | 28,160
Credit derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 15,000 | 15,000
Derivative financial assets | 180 | 236
Derivative financial liabilities | 326 | 275
Credit derivatives | Derivatives traded over the counter |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 15,000 | 15,000
Derivative financial assets | 180 | 236
Derivative financial liabilities | £ 326 | £ 275

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