Impairment loss on financial assets Tax expense (income) Insurance expense Operating Profit Analysis [Abstract] Operating Exceptional Items Operating exceptional items Operating Profit Before System Fund Reimbursables And Exceptional Items Operating profit before system fund reimbursables and exceptional items. Profit Loss From Operations Of System Fund And Reimbursable Result Profit loss from operations of system fund and reimbursable result. Revenue from contracts with customers System Fund And Reimbursable Expenses System Fund And Reimbursable Expenses System fund and reimbursable expenses. System Fund And Reimbursable Revenues System fund and reimbursable revenues. Reclassification adjustments on cash flow hedges for which hedged item affected profit or loss, net of tax Currency Translation Reserve [Member] Currency translation reserve member. Fair Value Reserve [Member] Fair value reserve [Member]. Shares Held By Employee Share Trusts [Member] Shares held by employee share trusts member. IFRS9 [Member] IFRS9 member. Decrease (increase) through tax on share-based payment transactions, equity Purchase Of Own Shares By Employee Share Trusts Purchase Of Own Shares By Employee Share Trusts Purchase of own shares by employee share trusts. Purchase of treasury shares Release Of Own Shares By Employee Share Trusts Release of own shares by employee share trusts. Contract Costs Current IFRS current Assets recognised from costs to obtain or fulfill contracts with customers. Contract Costs Noncurrent IFRS non-current Assets recognised from costs to obtain or fulfill contracts with customers. Deferred Compensation Plan Investments Deferred compensation plan investments. Current contract liabilities Current derivative financial liabilities Current lease liabilities Total current liabilities Current provisions Current tax liabilities, current Deferred Compensation Plan Liabilities Deferred Compensation Plan Liabilities Deferred compensation plan liabilities. Deferred tax liabilities Insurance Contracts Issued That Are Liabilities Current Insurance Contracts Issued That Are Liabilities Current Insurance contracts issued that are liabilities current. Insurance Contracts Issued That Are Liabilities Non Current Insurance Contracts Issued That Are Liabilities Non Current Insurance​ contracts ​issued​ that​ are​ liabilities​ non current. Total liabilities Non-current portion of non-current borrowings Non-current contract liabilities Non-current derivative financial liabilities Non-current lease liabilities Total non-current liabilities Trade and other non-current payables Non-current provisions Non-current net defined benefit liability Current borrowings Trade and other current payables Net assets (liabilities) Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Net cash flows from (used in) financing activities Dividends paid, classified as financing activities Dividends paid to non-controlling interests, classified as financing activities Payments of lease liabilities, classified as financing activities Proceeds From Currency Swaps Classified As Financial Activities Proceeds from currency swaps classified as financial activities. Purchase Of Own Shares By Employee Share Trust Purchase Of Own Shares By Employee Share Trust Purchase of own shares by employee share trusts. Repayments of bonds, notes and debentures Net cash flows from (used in) investing activities Deferred And Contingent Consideration Paid Investing Activities Deferred And Contingent Consideration Paid Investing Activities Deferred and contingent consideration paid investing activities. Purchase of financial instruments, classified as investing activities Purchase of intangible assets, classified as investing activities Purchase of interests in investments accounted for using equity method Purchase of property, plant and equipment, classified as investing activities Net cash flows from (used in) operating activities Net cash flows from (used in) operations Deferred Purchase Consideration Paid Classified As Operating Activities Deferred Purchase Consideration Paid As Operating Activities Deferred purchase consideration paid classified as operating activities. Income taxes paid (refund), classified as operating activities Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes Interest paid, classified as operating activities Description Of Accounting Policy For Deferred Compensation Plan Explanatory [Policy Text Block] Description of accounting policy for deferred compensation plan explanatory [Policy Text Block]. Description Of Accounting Policy For Potential Impact Of Climate Change Explanatory [Policy Text Block] Description of accounting policy for potential impact of climate change explanatory [Policy Text Block]. Disclosure Of Detailed Information About Net Debt Explanatory Disclosure of detailed information about net debt explanatory [Text block]. Disclosure Of Exceptional Items Explanatory Disclosure of exceptional items explanatory [Text block]. Disclosure Of System Fund And Reimbursables Explanatory [Text Block] Disclosure​ of system​ fund​ and reimbursables explanatory [Text Block].