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Summary of Significant Accounting Policies Advertising Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Company Operated Restaurant Advertising Expense | $ 325.5 | $ 365.8 | $ 388.8
Other Marketing Related Expenses | $ 329.2 | $ 81.5 | $ 88.0

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- Definition Advertising costs of Company-operated restaurants included in operating expenses + References No definition available. + Details
Name: | mcd_CompanyOperatedRestaurantAdvertisingExpense
Namespace Prefix: | mcd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Production costs for radio and television advertising as well as other marketing-related expenses included in selling, general and administrative expenses. + References No definition available. + Details
Name: | mcd_OtherMarketingRelatedExpenses
Namespace Prefix: | mcd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration