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Financial instruments: valuation - Valuation techniques (Details) - Level 3 | Dec. 31, 2022 | Dec. 31, 2022 GBP (£) | Dec. 31, 2021 | Dec. 31, 2021 GBP (£)
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Loans | Price | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 1.13 |  | 1.06 |
Loans | Discount margin | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments |  |  | 0.0046 |
Loans | Discount margin | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments |  |  | 0.0055 |
Loans | Credit spreads | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.0056 |  | 0.0040 |
Loans | Credit spreads | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.0114 |  | 0.0102 |
Debt securities | Price | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 2.25 |  | 2.40 |
Equity shares | Price | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.30 | 34,027 | 0.07 | 30,378
Equity shares | Discount margin | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.06 |  | 0.06 |
Equity shares | Discount margin | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.08 |  | 0.08 |
Equity shares | Fund NAV | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.80 |  | 0.80 |
Equity shares | Fund NAV | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 1.20 |  | 1.20 |
Credit derivatives | Correlation | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | (0.15) |  | (0.15) |
Credit derivatives | Correlation | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.95 |  | 0.95 |
Credit derivatives | Credit spreads | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.0007 |  | 0.0006 |
Credit derivatives | Credit spreads | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.0530 |  | 0.0635 |
Credit derivatives | Volatility | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.30 |  | 0.30 |
Credit derivatives | Volatility | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.80 |  | 1.08 |
Credit derivatives | Upfront points | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.99 |  | 1 |
Credit derivatives | Recovery rate | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.60 |  | 0.60 |
Interest rate and FX derivatives | Correlation | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | (0.50) |  | (0.50) |
Interest rate and FX derivatives | Correlation | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 1 |  | 1 |
Interest rate and FX derivatives | Volatility | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.30 |  | 0.17 |
Interest rate and FX derivatives | Volatility | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 1.27 |  | 0.77 |
Interest rate and FX derivatives | Constant Prepayment Rate | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.02 |  | 0.02 |
Interest rate and FX derivatives | Constant Prepayment Rate | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.21 |  | 0.16 |
Interest rate and FX derivatives | Mean Reversal | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.92 |  | 0.92 |
Interest rate and FX derivatives | Inflation volatility | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.01 |  | 0.01 |
Interest rate and FX derivatives | Inflation volatility | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.02 |  | 0.02 |
Interest rate and FX derivatives | Inflation rate | Minimum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.02 |  | 0.02 |
Interest rate and FX derivatives | Inflation rate | Maximum |  |  |  |
Disclosure of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs, Assets and Liabilities |  |  |  |
Significant unobservable input, financial instruments | 0.03 |  | 0.03 |

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