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Insurance service expenses and other expenditure - Fair value of options and awards (Details) | 12 Months Ended |  |  |
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Dec. 31, 2024 GBP (£) entity Y £ / shares | Dec. 31, 2024 GBP (£) entity Y $ / shares | Dec. 31, 2023 GBP (£) Y £ / shares | Dec. 31, 2023 GBP (£) Y $ / shares | Dec. 31, 2022 GBP (£) Y £ / shares | Dec. 31, 2022 GBP (£) Y $ / shares | Dec. 31, 2024 HKD ($) | Dec. 31, 2023 HKD ($) | Dec. 31, 2022 HKD ($)
Share-based payment |  |  |  |  |  |  |  |  |
Volatility assumption - number of competitors in basket | entity | 12 | 12 |  |  |  |  |  |  |
Volatility assumption - average volatility for basket of competitors (as a percent) | 27.00% | 27.00% | 26.00% | 26.00% | 26.00% | 26.00% |  |  |
Volatility assumption - period of correlations for basket of competitors | 3 years | 3 years |  |  |  |  |  |  |
Sharesave and ISSOSNE |  |  |  |  |  |  |  |  |
Share-based payment |  |  |  |  |  |  |  |  |
Dividend yield (as a percent) | 2.08% | 2.08% | 1.38% | 1.38% | 1.11% | 1.11% |  |  |
Expected volatility (as a percent) | 28.17% | 28.17% | 30.02% | 30.02% | 25.68% | 25.68% |  |  |
Risk-free interest rate (as a percent) | 3.57% | 3.57% | 4.55% | 4.55% | 3.97% | 3.97% |  |  |
Expected option life (years) | Y | 4.03 | 4.03 | 3.95 | 3.95 | 4.52 | 4.52 |  |  |
Weighted average exercise price | £ / shares | £ 5.24 |  | £ 7.75 |  | £ 7.37 |  |  |  |
Weighted average share price at grant date | £ / shares | £ 7.16 |  | £ 8.89 |  | £ 9.54 |  |  |  |
Weighted average fair value at grant date | £ | £ 2.5 | £ 2.5 | £ 2.85 | £ 2.85 | £ 3.45 | £ 3.45 |  |  |
Prudential LTIP (TSR) |  |  |  |  |  |  |  |  |
Share-based payment |  |  |  |  |  |  |  |  |
Expected volatility (as a percent) | 28.45% | 28.45% | 31.50% | 31.50% | 33.64% | 33.64% |  |  |
Risk-free interest rate (as a percent) | 4.39% | 4.39% | 4.34% | 4.34% | 2.79% | 2.79% |  |  |
Weighted average share price at grant date | $ / shares |  | £ 75.1 |  | £ 112.76 |  | £ 113.83 |  |  |
Weighted average fair value at grant date | $ |  |  |  |  |  |  | $ 29.29 | $ 49.6 | $ 21.32
Other awards |  |  |  |  |  |  |  |  |
Share-based payment |  |  |  |  |  |  |  |  |
Weighted average fair value at grant date | $ |  |  |  |  |  |  | $ 72.58 | $ 111.97 | $ 113.81

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition 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. + References No definition available. + Details
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- Definition The exercise price of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Prior period for which correlations between the entity and a basket of competitors are analysed for determining the volatility assumption for valuation of awards in share-based payment arrangements. + References No definition available. + Details
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- Definition The number of competitors in a basket used to analyse correlations between the entity and competitors in determining volatility for valuation of awards in share-based payment arrangements. + References No definition available. + Details
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- Definition The average volatility of a basket of competitors analysed for determining the volatility assumption for valuation of awards in share-based payment arrangements. + References No definition available. + Details
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