Issue of other equity instruments (note 33) Issue of other equity instruments (note 33) Accounting policies [Abstract] Accounting policies [Abstract] Income taxes paid, classified as operating activities Deferred tax, income statement transfers in respect of disposals Deferred tax, income statement transfers in respect of disposals Deferred tax, income statement transfers in respect of disposals Total comprehensive income attributable to other equity holders Total comprehensive income attributable to other equity holders Assets (liabilities) of benefit plan Income statement transfers in respect of disposals, net of tax Income statement transfers in respect of disposals, net of tax Repayments of subordinated liabilities OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments Payments of other equity instruments - Repurchases and redemptions of other equity instruments Payments of other equity instruments - Repurchases and redemptions of other equity instruments Repurchases and redemptions of other equity instruments Deferred tax relating to remeasurements of defined benefit plans Deferred tax relating to remeasurements of defined benefit plans Deferred tax relating to remeasurements of defined benefit plans Net income statement transfers - Deferred tax Net income statement transfers - Deferred tax Net income statement transfers - Deferred tax Current tax relating to remeasurements of defined benefit plans Current tax relating to remeasurements of defined benefit plans Current tax relating to remeasurements of defined benefit plans Disclosure of insurance contracts - Summary of contractual service margin [Text Block] ifrs-full_DisclosureOfInsuranceContractsExplanatory Equity attributable to owners of parent - Ordinary shareholders equity Total equity excluding non-controlling interests Interest expense Interest received Interest received Distributions on other equity instruments Distributions on other equity instruments Segmental analysis [Abstract] Segmental analysis [Abstract] Other non-financial assets - Retirement benefit assets Retirement benefit assets Fee and commission expense Disclosure of insurance contracts - Insurance and participating investment contracts assets and liabilities [Text Block] ifrs-full_DisclosureOfInsuranceContractsExplanatory Disclosure of insurance contracts - Impacts of insurance and participating investment contracts recognised in the year [Text Block] ifrs-full_DisclosureOfInsuranceContractsExplanatory Disclosure of insurance contracts - Reconciliation of insurance balances [Text Block] ifrs-full_DisclosureOfInsuranceContractsExplanatory Deferred tax, effective portion of changes in fair value taken to other comprehensive income Deferred tax, effective portion of changes in fair value taken to other comprehensive income Deferred tax, effective portion of changes in fair value taken to other comprehensive income Gains (losses) on cash flow hedges, net of tax - Net income transfers Deferred tax on change in fair value of debt securities held at fair value through other comprehensive income Deferred tax on change in fair value of debt securities held at fair value through other comprehensive income Total comprehensive income attributable to ordinary shareholders Total comprehensive income attributable to ordinary shareholders Payments of other equity instruments - Distributions in respect of other equity instruments Payments of other equity instruments - Distributions in respect of other equity instruments Distributions in respect of other equity instruments Interest paid Interest paid Operating expense Tax expense (income) Purchase of financial instruments, classified as investing activities Dividends paid to non-controlling interests, classified as financing activities Income statement transfers in respect of disposals Income statement transfers in respect of disposals Critical accounting estimates [Abstract] Critical accounting estimates [Abstract] Purchase of intangible assets, classified as investing activities Redemption of preference shares Redemption of preference shares Other non-financial assets - Other assets Other assets Other operating income (expense) - Net investment return on assets held to back insurance and investment contracts Net investment return on assets held to back insurance and investment contracts Income statement transfers in respect of impairment, net of tax Income statement transfers in respect of impairment, net of tax Purchase of property, plant and equipment, classified as investing activities Proceeds from changes in ownership interests in subsidiaries that do not result in loss of control Gains (losses) on cash flow hedges, net of tax - Effective portion Net income statement transfers, cash flow hedges - Pre tax Net income statement transfers, cash flow hedges - Pre tax Other operating income (expense) - Net investment return and finance result in respect of insurance and investment contracts Net investment return and finance result in respect of insurance and investment contracts Dividends paid to equity holders of parent, classified as financing activities Share capital and premium [Member] Share capital and premium Share buyback (note 32) Share buyback (note 32) Current tax on change in fair value of debt securities held at fair value through other comprehensive income Current tax on change in fair value of debt securities held at fair value through other comprehensive income Current tax on change in fair value of debt securities held at fair value through other comprehensive income Interest paid, classified as financing activities Repurchases and redemptions of other equity instruments (note 33) Repurchases and redemptions of other equity instruments (note 33) Disclosure of insurance contracts - Net investment return [Text Block] ifrs-full_DisclosureOfInsuranceContractsExplanatory