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Financial instruments: valuation - Valuation techniques (Details) - Level 3 - GBP (£) |  |  | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets | £ 100,000,000 | £ 140,000,000 |  |
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, assets | 110,000,000 | 110,000,000 |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities | 30,000,000 | 40,000,000 |  |
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities | £ 30,000,000 | £ (50,000,000) |  |
Recurring |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Basis points of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 18 | 0.0021
Basis Points of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | 0.08 | 0.0015
Recurring | Loans | Price-based | Price |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of reasonably possible increase in unobservable input, assets | 106.00% | 105.00% | 106.00% | 105.00%
Recurring | Loans | Discounted cash flow | Discount margin |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of reasonably possible increase in unobservable input, assets | 0.55% | 2.26% | 0.55% | 2.26%
Percentage of reasonably possible decrease in unobservable input, assets | 0.46% | 0.51% | 0.46% | 0.51%
Recurring | Loans | Discounted cash flow | Credit spreads |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of reasonably possible increase in unobservable input, assets | 1.02% | 1.19% | 1.02% | 1.19%
Percentage of reasonably possible decrease in unobservable input, assets | 0.40% | 0.69% | 0.40% | 0.69%
Recurring | Debt securities | Price-based | Price |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of reasonably possible increase in unobservable input, assets | 240.00% | 232.00% | 240.00% | 232.00%
Recurring | Equity shares | Price-based | Price |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets | £ 27,737 |  | £ 30,378 |
Recurring | Equity shares | Market comparables | Price |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of reasonably possible increase in unobservable input, assets | 7.00% | 80.00% | 7.00% | 80.00%
Recurring | Equity shares | Net asset valuation | Fund NAV |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of reasonably possible increase in unobservable input, assets | 120.00% | 120.00% | 120.00% | 120.00%
Percentage of reasonably possible decrease in unobservable input, assets | 80.00% | 80.00% | 80.00% | 80.00%
Recurring | Equity shares | Discounted cash flow | Discount margin |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of reasonably possible increase in unobservable input, assets | 8.00% | 9.00% | 8.00% | 9.00%
Percentage of reasonably possible decrease in unobservable input, assets | 6.00% | 7.00% | 6.00% | 7.00%
Recurring | Credit Default Swap | Credit Derivative Pricing | Credit spreads |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 635.00% | 500.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | 0.06% | 0.02%
Recurring | Credit Default Swap | Option pricing model | Correlation |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 95.00% | 95.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | (15.00%) | (50.00%)
Recurring | Credit Default Swap | Option pricing model | Volatility |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 108.00% | 80.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | 30.00% | 27.00%
Recurring | Credit Default Swap | Option pricing model | Upfront points |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 100.00% | 100.00%
Recurring | Credit Default Swap | Option pricing model | Recovery rate |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 60.00% | 40.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  |  | 10.00%
Recurring | Derivatives [Member] | Option pricing model | Volatility |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 77.00% | 60.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | 17.00% | 17.00%
Recurring | Interest and foreign exchange contracts | Inflation volatility |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 2.00% | 2.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | 1.00% | 1.00%
Recurring | Interest and foreign exchange contracts | Inflation rate |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 3.00% | 2.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | 2.00% | 1.00%
Recurring | Interest and foreign exchange contracts | Option pricing model | Correlation |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 100.00% | 100.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | (50.00%) | (50.00%)
Recurring | Interest and foreign exchange contracts | Option pricing model | Constant Prepayment Rate |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 16.00% | 18.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | 2.00% | 2.00%
Recurring | Interest and foreign exchange contracts | Option pricing model | Mean Reversal |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 92.00% | 92.00%
Recurring | Equity | Option pricing model | Correlation |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Percentage of Reasonably Possible Increase In Unobservable Input, Assets and Liabilities |  |  | 87.00% | 87.00%
Percentage of Reasonably Possible Decrease In Unobservable Input, Assets and Liabilities |  |  | (53.00%) | (53.00%)

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