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Derivative financial instruments (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2024 GBP (£) | Dec. 31, 2023 GBP (£) | Dec. 31, 2022 GBP (£) | Dec. 31, 2024 USD ($) GBP (£) | Dec. 31, 2024 EUR (€) GBP (£) | Dec. 31, 2024 JPY (¥) GBP (£) | Dec. 31, 2023 USD ($) GBP (£) | Dec. 31, 2023 EUR (€) GBP (£) | Dec. 31, 2023 JPY (¥) GBP (£)
Derivative financial instruments |  |  |  |  |  |  |  |  |
Net gain/(loss) on net investment hedge, recognised in other comprehensive income | £ (17) | £ 109 | £ (68) |  |  |  |  |  |
Net investment hedge |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Hedge ratio | 1 |  |  |  |  |  |  |  |
Gain or (loss) due to ineffectiveness | £ 0 | 0 |  |  |  |  |  |  |
Net gain/(loss) on net investment hedge, recognised in other comprehensive income | £ (17) | £ 109 | £ (68) |  |  |  |  |  |
Net investment hedge | US dollar |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Amount of hedged item | $ |  |  |  | $ 2,310 |  |  | $ 2,756 |  |
Net investment hedge | Euro |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Amount of hedged item | € |  |  |  |  | € 315 |  |  | € 343 |
Net investment hedge | JPY |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Amount of hedged item | ¥ |  |  |  |  |  | ¥ 2,055 |  |  | ¥ 1,898
Cross-currency swaps | Net investment hedge | US dollar |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Hedge ratio | 1 | 1 |  |  |  |  |  |  |
Nominal amount of hedging instrument |  |  |  | 1,300 | 1,300 | 1,300 | 1,641 | 1,641 | 1,641
Cross-currency swaps | Net investment hedge | JPY |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Hedge ratio | 1 | 1 |  |  |  |  |  |  |
Nominal amount of hedging instrument |  |  |  | 10 | 10 | 10 | 11 | 11 | 11
Cross-currency swaps notional | Net investment hedge | US dollar |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument | $ |  |  |  | 1,627 |  |  | 2,091 |  |
Cross-currency swaps notional | Net investment hedge | JPY |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument | ¥ |  |  |  |  |  | 2,000 |  |  | 1,925
Cross-currency swaps future interest cash flow | Net investment hedge | US dollar |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument | $ |  |  |  | 137 |  |  | 206 |  |
Cross-currency swaps future interest cash flow | Net investment hedge | JPY |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument | ¥ |  |  |  |  |  | 55 |  |  | 27
Loan notional | Net investment hedge | US dollar |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Hedge ratio | 1 | 1 |  |  |  |  |  |  |
Nominal amount of hedging instrument |  |  |  | 436 | 436 | 436 | 360 | 360 | 360
Bonds | Net investment hedge | Euro |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |
Hedge ratio | 1 | 1 |  |  |  |  |  |  |
Nominal amount of hedging instrument |  |  |  | 261 | 261 | 261 | 298 | 298 | 298

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