The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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Derivatives - Narrative (Details) £ in Millions	12 Months Ended
Derivatives - Narrative (Details) £ in Millions	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