Deferred Compensation Plan Liabilities Deferred Compensation Plan Liabilities Deferred Compensation Plan Liabilities Release Of Own Shares By Employee Share Trusts Release Of Own Shares By Employee Share Trusts Non-current contract liabilities Disclosure Of System Fund And Reimbursables Explanatory [Text Block] Disclosure Of System Fund And Reimbursables Explanatory Current provisions Non-current provisions Payments of lease liabilities, classified as financing activities Non-current portion of non-current borrowings Cash flows from (used in) financing activities Non-current lease liabilities Insurance Contracts Issued That Are Liabilities Current Insurance Contracts Issued That Are Liabilities Current Insurance Contracts Issued That Are Liabilities Current Deferred purchase consideration paid Deferred And Contingent Consideration Paid Investing Activities Deferred And Contingent Consideration Paid Investing Activities Trade and other current payables Non-current net defined benefit liability Deferred Purchase Consideration Paid Classified As Operating Activities Deferred Purchase Consideration Paid Classified As Operating Activities Contract costs Noncurrent Contract costs Noncurrent Description Of Accounting Policy For Deferred Compensation Plan Explanatory [Text Block] Description Of Accounting Policy For Deferred Compensation Plan Explanatory Purchase of own shares by employee share trusts Purchase of own shares by employee share trusts Fee Business [Member] Fee Business Cash flows from (used in) investing activities Trade and other non-current payables Current contract liabilities Disclosure Of Exceptional Items Explanatory [Text Block] Disclosure Of Exceptional Items Explanatory System Fund and reimbursable expenses System Fund and reimbursable expenses Deferred tax liabilities Operating Exceptional Items Operating Exceptional Items Insurance Contracts Issued That Are Liabilities Non Current Insurance Contracts Issued That Are Liabilities Non Current Insurance Contracts Issued That Are Liabilities Non Current Cash flows from (used in) operating activities Disclosure Of Detailed Information About Net Debt Explanatory [Text Block] Disclosure Of Detailed Information About Net Debt Explanatory Owned & Leased Hotels [Member] Owned & Leased Hotels Profit Loss From Operations Of System Fund And Reimbursable Result Profit Loss From Operations Of System Fund And Reimbursable Result Non-current derivative financial liabilities Statement [Table] Statement [Table] Dividends paid to non-controlling interests, classified as financing activities Payments to acquire or redeem entity's shares Statement [Line Items] Statement [Line Items] Deferred Compensation Plan Investments Deferred Compensation Plan Investments Shares Held By Employee Share Trusts [Member] Shares Held By Employee Share Trusts Purchase of intangible assets, classified as investing activities Current lease liabilities Contract Costs Current Contract Costs Current Current borrowings Assets (liabilities) Operating profit before System Fund, reimbursables and exceptional items Operating profit before System Fund, reimbursables and exceptional items Dividends paid, classified as financing activities Description Of Accounting Policy For Potential Impact Of Climate Change Explanatory [Text Block] Description Of Accounting Policy For Potential Impact Of Climate Change Explanatory System Fund And Reimbursable Revenue [Member] System Fund And Reimbursable Revenue Repayments of bonds, notes and debentures Purchase Of Own Shares By Employee Share Trust Purchase Of Own Shares By Employee Share Trust Increase (decrease) in cash and cash equivalents before effect of exchange rate changes Payments For Settlement Of Currency Swaps Payments For Settlement Of Currency Swaps Current tax liabilities, current