Impairment loss on financial assets Tax expense (income) Operating Profit Analysis [Abstract] Operating profit loss before system Fund result and Exceptional Items Operating profit loss before system fund result and exceptional items. Operating Exceptional Items Operating exceptional items Profit Loss From Operations Of System Fund Profit loss from operations of system fund. System Fund Expenses System Fund Expenses System fund expenses. Cost Of Reimbursable Expense 1 Cost Of Reimbursable Expense Cost associated with reimbursable income. This occurs when a services entity incurs expenses on behalf of the client and passes through the cost of reimbursable expenses to a client. Reimbursement Revenue Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. Revenue from contracts with customers System Fund Revenue System fund revenue. Income Tax Relating To Employee Benefit Contribution Of Other Comprehensive Income Income Tax Relating To Employee Benefit Contribution Of Other Comprehensive Income Tax related to pension contributions. Reclassification adjustments on cash flow hedges for which hedged item affected profit or loss, net of tax Shares Held By Employee Share Trusts [Member] Shares held by employee share trusts member. Currency Translation Reserve [Member] Currency translation reserve member. Fair Value Reserve [Member] Fair value reserve [Member]. Purchase Of Own Shares By Employee Share Trusts Purchase Of Own Shares By Employee Share Trusts Purchase of own shares by employee share trusts. Release Of Own Shares By Employee Share Trusts Release of own shares by employee share trusts. Purchase of treasury shares IFRS9 [Member] IFRS9 member. Sharebased Payment Transactions Reclassification Of Cash Settled Awards Sharebased payment transactions reclassification of cash settled awards. Net assets (liabilities) Current provisions Current tax liabilities, current Trade and other current payables Non-current lease liabilities Non-current derivative financial liabilities Deferred tax liabilities Total non-current liabilities Total liabilities Non-current portion of non-current borrowings Current lease liabilities Non-current net defined benefit liability Trade and other non-current payables Current contract liabilities Non-current contract liabilities Non-current provisions Total current liabilities Deferred Compensation Plan Liabilities Deferred Compensation Plan Liabilities Deferred compensation plan liabilities. Current borrowings Contract Costs Current IFRS current Assets recognised from costs to obtain or fulfill contracts with customers. Deferred Compensation Plan Investments Deferred compensation plan investments. Contract Costs Noncurrent IFRS non-current Assets recognised from costs to obtain or fulfill contracts with customers. Repayments of bonds, notes and debentures Dividends paid, classified as financing 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. Payments of lease liabilities, classified as financing activities Repayment To Proceeds From Issue Of Commercial Paper Repayment To Proceeds From Issue Of Commercial Paper Repayment to proceeds from issue of commercial paper. Proceeds From Currency Swaps Proceeds from currency swaps. Net cash flows from (used in) financing activities Interest paid, classified as operating activities Net cash flows from (used in) operations Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Net cash flows from (used in) operating activities Net cash flows from (used in) investing activities Interest paid, classified as investing activities Purchase of intangible assets, classified as investing activities Finance Lease Receipts Classified As Investing Activities Finance lease receipts classified as investing activities. Purchase of financial instruments, classified as investing activities Purchase of property, plant and equipment, classified as investing activities Deferred And Contingent Consideration Paid Investing Activities Contingent Purchase Consideration Paid Investing Activities Deferred and contingent consideration paid investing activities. Other cash payments to acquire interests in joint ventures, classified as investing activities Income taxes paid (refund), 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 Exceptional Items Explanatory [Text Block] Disclosure of exceptional items explanatory [Text Block]. Disclosure Of Assets And Liabilities Classified As Held For Sale Explanatory [Text Block] Disclosure of assets and liabilities classified as held for sale explanatory [Text Block]. Disclosure Of System Fund Explanatory [Text Block] Disclosure​ of system​ fund​ explanatory [Text Block].