Adjustments for gain (loss) on disposal of investments in subsidiaries, joint ventures and associates Non-controlling interests Components of profit or loss [Axis] Components of profit or loss Income tax impact on exchange differences on translation of foreign operations Reserve own shares Statement of profit or loss [Table] Statement of profit or loss [Table] Statement of profit or loss Adjustments for dividend income Financial assets at fair value through other comprehensive income Cash flow from investing activities Dividends received from equity investments Dividends received from equity investments Net treasury income through CCP business Net treasury income through CCP business Current tax comparative adjustment Current tax comparative adjustment Clearing business liabilities Clearing business liabilities Recognition of combined derivative instrument Recognition of combined derivative instrument Total profit or loss [Member] Total profit or loss [Member] Total profit or loss Goodwill and other intangible assets Current Trade and other payables Current Trade and other payables Redemption of other current financial assets Redemption of other current financial assets Non-current liabilities Acquisition of subsidiaries, net of cash acquired Non-cash exchange (losses)/gains on cash and cash equivalents Disclosure of non-underlying items [Text Block] Disclosure of non-underlying items Other Long Term Provisions And Provisions For Other Long Term Employee Benefit Expenses Other Long Term Provisions And Provisions For Other Long Term Employee Benefit Expenses Other Long Term Provisions And Provisions For Other Long Term Employee Benefit Expenses Underlying items [Member] Underlying items [Member] Underlying items Borrowings Clearing business assets Clearing business assets Share-based payments Dividends received from associates Current assets Financial assets at amortised cost Increase (decrease) from delivery of shares Increase (decrease) from delivery of shares Share based payments Share based payments Settlement payment Settlement payment Equity Employee share transactions Employee share transactions Comprehensive income attributable to: Net cash generated by operating activities Proceeds from sales of investments other than investments accounted for using equity method Total Shareholders' equity Net cash (used in) financing activities Lease liabilities Foreign currency translation reserve Assets Share premium Non-underlying items [Member] Non-underlying items [Member] Non-underlying items Derivative financial liabilities Dividends paid Dividends paid to non-controlling interests Net cash (used in) investing activities Contract liabilities Purchase of other current financial assets Purchase of other current financial assets Lease liabilities Description of accounting policy for non-underlying items [Text Block] Description of accounting policy for non-underlying items Changes in working capital and provisions Changes in working capital and provisions Changes in working capital and provisions Current liabilities Non-current assets Retained earnings Statement of profit or loss [Line Items] Statement of profit or loss [Line Items] Purchase of property, plant and equipment, classified as investing activities Equity and liabilities Contract liabilities Other non-current assets and other assets Other comprehensive income for the year Adjustments for undistributed share of profit from associates and joint ventures, and impairments thereof Adjustments for undistributed share of profit from associates and joint ventures, and impairments thereof Adjustments for undistributed share of profit from associates and joint ventures, and impairments thereof Depreciation and amortisation Comprehensive income attributable to owners of the parent Statement of profit or loss [Member] Statement of profit or loss Revenue and other operating income Profit for the period Transactions in own shares Fair value reserve of financial assets at FVOCI Total other reserves Tax expense (income) Current Income tax liabilities Trade and other receivables Borrowings Issued capital Profit before income tax Equity Cash flow from operating activities Adjustments for: Share of profit (loss) of investments accounted for using the equity method and impairments thereof Share of net profit/(loss) of associates and joint ventures accounted for using the equity method, and impairments thereof Comprehensive income attributable to non-controlling interests Profit attributable to: Net (decrease)/increase in cash and cash equivalents Cash flow from financing activities