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Derivatives - Narrative (Details) £ in Millions | 12 Months Ended
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Dec. 31, 2021 GBP (£) ₨ / £ | Dec. 31, 2021 GBP (£) $ / £ | Dec. 31, 2021 GBP (£) SFr / £ | Dec. 31, 2021 GBP (£) ¥ / £ | Dec. 31, 2021 GBP (£) ¥ / £ | Dec. 31, 2021 GBP (£) kr / £ | Dec. 31, 2021 GBP (£) kr / £ | Dec. 31, 2021 GBP (£) kr / £ | Dec. 31, 2021 GBP (£) د.إ / $ | Dec. 31, 2020 GBP (£) ₨ / £ | Dec. 31, 2020 GBP (£) $ / £ | Dec. 31, 2020 GBP (£) ¥ / £ | Dec. 31, 2020 GBP (£) ¥ / € | Dec. 31, 2020 GBP (£) kr / £ | Dec. 31, 2020 GBP (£) kr / £ | Dec. 31, 2020 GBP (£) kr / £
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial assets | £ 106,139 | £ 106,139 | £ 106,139 | £ 106,139 | £ 106,139 | £ 106,139 | £ 106,139 | £ 106,139 | £ 106,139 | £ 166,523 | £ 166,523 | £ 166,523 | £ 166,523 | £ 166,523 | £ 166,523 | £ 166,523
Derivative financial liabilities | 100,835 | 100,835 | 100,835 | 100,835 | 100,835 | 100,835 | 100,835 | 100,835 | 100,835 | 160,705 | 160,705 | 160,705 | 160,705 | 160,705 | 160,705 | 160,705
Interest rate risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of financial assets | 8,919,000 | 8,919,000 | 8,919,000 | 8,919,000 | 8,919,000 | 8,919,000 | 8,919,000 | 8,919,000 | 8,919,000 | 10,703,000 | 10,703,000 | 10,703,000 | 10,703,000 | 10,703,000 | 10,703,000 | 10,703,000
Derivative financial assets | 67,458 | 67,458 | 67,458 | 67,458 | 67,458 | 67,458 | 67,458 | 67,458 | 67,458 | 114,115 | 114,115 | 114,115 | 114,115 | 114,115 | 114,115 | 114,115
Derivative financial liabilities | £ 61,206 | £ 61,206 | £ 61,206 | £ 61,206 | £ 61,206 | £ 61,206 | £ 61,206 | £ 61,206 | £ 61,206 | £ 105,214 | £ 105,214 | £ 105,214 | £ 105,214 | £ 105,214 | £ 105,214 | £ 105,214
Exchange rate risk | Cash flow hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average foreign exchange rate | 106.58 | 1.38 | 1.25 | 132.93 | 8.74 |  |  |  |  | 95.29 | 1.36 | 132.93 | 120.21 |  |  |
Exchange rate risk | Foreign exchange |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average foreign exchange rate |  | 1.32 |  |  |  | 11.74 | 8.85 | 12.12 | 3.67 |  |  |  |  | 11.15 | 8.28 | 12.73
Exchange rate risk | Net investment hedging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of financial assets | £ 500 | £ 500 | £ 500 | £ 500 | £ 500 | £ 500 | £ 500 | £ 500 | £ 500 | £ 200 | £ 200 | £ 200 | £ 200 | £ 200 | £ 200 | £ 200

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