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Derivative financial instruments (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 GBP (£) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 GBP (£) | Dec. 31, 2022 USD ($) GBP (£) | Dec. 31, 2022 EUR (€) GBP (£) | Dec. 31, 2022 AUD ($) GBP (£) | Dec. 31, 2022 JPY (¥) GBP (£) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 AUD ($) | Dec. 31, 2021 JPY (¥)
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Net gain/(loss) on net investment hedge, recognised in other comprehensive income | £ (68) | £ 15 | £ (17) |  |  |  |  |  |  |  |
Net investment hedge |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Hedge ratio | 1 |  |  |  |  |  |  |  |  |  |
Gain or (loss) due to ineffectiveness | £ (1) | 2 |  |  |  |  |  |  |  |  |
Net gain/(loss) on net investment hedge, recognised in other comprehensive income | £ (68) | £ 15 |  |  |  |  |  |  |  |  |
Net investment hedge | US dollar |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Amount of hedged item | $ |  |  |  | $ 3,065 |  |  |  | $ 900 |  |  |
Net investment hedge | Euro |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Amount of hedged item | € |  |  |  |  | € 577 |  |  |  | € 552 |  |
Net investment hedge | AUD |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Amount of hedged item | $ |  |  |  |  |  | $ 8 |  |  |  |  |
Net investment hedge | JPY |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Amount of hedged item | ¥ |  |  |  |  |  |  | ¥ 1,870 |  |  |  |
Cross-currency swaps | Net investment hedge | US dollar |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Hedge ratio | 1 | 1 |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument |  | 596 |  | 1,728 | 1,728 | 1,728 | 1,728 |  |  |  |
Gain or (loss) due to ineffectiveness | £ (1) | £ 2 |  |  |  |  |  |  |  |  |
Cross-currency swaps | Net investment hedge | JPY |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Hedge ratio | 1 | 1 |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument |  | 8 |  | 12 | 12 | 12 | 12 |  |  |  | 1,250
Cross-currency swaps notional | Net investment hedge | US dollar |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument | $ |  |  |  | 2,091 |  |  |  | 807 |  |  |
Cross-currency swaps future interest cash flow | Net investment hedge | US dollar |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument | $ |  |  |  | 274 |  |  |  | 93 |  |  |
Cross-currency swaps future interest cash flow | Net investment hedge | JPY |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument | ¥ |  |  |  |  |  |  | 55 |  |  |  | 0
Bonds | Net investment hedge | Euro |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Hedge ratio | 1 | 1 |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument |  | 464 |  | 510 | 510 | 510 | 510 |  | 552 |  |
Overdraft | Net investment hedge | AUD |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Hedge ratio | 1 | 1 |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument |  | 5 |  | 5 | 5 | 5 | 5 |  |  | 9 |
Term loan | Net investment hedge | US dollar |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |
Hedge ratio | 1 |  |  |  |  |  |  |  |  |  |
Nominal amount of hedging instrument |  |  |  | 579 | 579 | 579 | 579 | 0 |  |  |

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