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Summary of Significant Accounting Policies Share-Based Compensation Expense and Effect on Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Share-based compensation expense	$ 109.6	$ 125.1	$ 117.5
After tax	$ 94.2	$ 108.1	$ 82.0
Earnings per common share-diluted	$ 0.12	$ 0.14	$ 0.10

X

- Definition

The effect of share-based compensation expense on net income per common share-diluted

+ References

No definition available.

+ Details

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Namespace Prefix:	mcd_
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Balance Type:	na
Period Type:	duration

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- References

No definition available.

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X

- Definition

Amount, after tax, of expense for award under share-based payment arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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