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Summary of Significant Accounting Policies Recent Accounting Pronouncements (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Allowance For Doubtful Accounts, Accounts Receivable	$ 55.3

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- Definition

Allowance For Doubtful Accounts, Accounts Receivable

+ References

No definition available.

+ Details

Name:	mcd_AllowanceForDoubtfulAccountsAccountsReceivable
Namespace Prefix:	mcd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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