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Derivative financial instruments - Net investment hedge (Details) - Net investment hedge € in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2022 GBP (£) $ / £ AUD ($) € / £ JPY (¥) ¥ / £ $ / £ EUR (€) USD ($) | Dec. 31, 2021 GBP (£) $ / £ USD ($) $ / £ ¥ / £ AUD ($) JPY (¥) € / £ EUR (€)
Derivative financial instruments |  |
Hedge ratio | 1 |
Ineffectiveness | £ (1) | £ 2
Cross-currency swaps | US dollar |  |
Derivative financial instruments |  |
Carrying amount |  | £ 2
Carrying amount | £ (105) |
Nominal amount | 1,728 | 596
Hedge ratio | 1 | 1
Change in fair value of outstanding instrument | £ (109) | £ (16)
Change in fair value of hedged item | (108) | (18)
Ineffectiveness | £ (1) | £ 2
Weighted average foreign exchange rate for the year | $ / £ | 1.250 | 1.296
Cross-currency swaps | JPY |  |
Derivative financial instruments |  |
Carrying amount |  | £ 1
Nominal amount | 1,925 | 1,250
Hedge ratio | 1 | 1
Change in fair value of outstanding instrument |  | £ 1
Change in fair value of hedged item |  | £ 1
Weighted average foreign exchange rate for the year | ¥ / £ | 137.071 | 134.326
Bonds | Euro |  |
Derivative financial instruments |  |
Carrying amount | £ (510) | £ (463)
Nominal amount | 577 | 552
Hedge ratio | 1 | 1
Change in fair value of outstanding instrument | £ (22) | £ 28
Change in fair value of hedged item | £ (22) | £ 28
Weighted average foreign exchange rate for the year | € / £ | 1.154 | 1.147
Term loan | US dollar |  |
Derivative financial instruments |  |
Carrying amount | £ (579) |
Nominal amount | 700 | 0
Hedge ratio | 1 |
Change in fair value of outstanding instrument | £ 60 |
Change in fair value of hedged item | £ 60 |
Weighted average foreign exchange rate for the year | $ / £ | 1.152 |
Overdraft | AUD |  |
Derivative financial instruments |  |
Carrying amount | £ (5) | £ (5)
Nominal amount | 8 | 9
Hedge ratio | 1 | 1
Weighted average foreign exchange rate for the year | $ / £ | 1.819 | 1.857

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2022-03-24 + Details
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