2.2.0.25falsefalse139 - Disclosure - Weighted-average assumptions (Detail)truefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $eol_PE2163----1010-K0023_STD_365_20101231_0http://www.sec.gov/CIK0000063908duration2010-01-01T00:00:002010-12-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170pureStandardhttp://www.xbrl.org/2003/instancepure0YearStandardhttp://www.mcdonalds.com/20101231Yearmcd0sharesStandardhttp://www.xbrl.org/2003/instanceshares0iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $eol_PE2163----1010-K0023_STD_365_20091231_0http://www.sec.gov/CIK0000063908duration2009-01-01T00:00:002009-12-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170sharesStandardhttp://www.xbrl.org/2003/instanceshares0iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0pureStandardhttp://www.xbrl.org/2003/instancepure0YearStandardhttp://www.mcdonalds.com/20101231Yearmcd0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008 USD ($) USD ($) / shares $eol_PE2163----1010-K0023_STD_366_20081231_0http://www.sec.gov/CIK0000063908duration2008-01-01T00:00:002008-12-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170sharesStandardhttp://www.xbrl.org/2003/instanceshares0iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0pureStandardhttp://www.xbrl.org/2003/instancepure0YearStandardhttp://www.mcdonalds.com/20101231Yearmcd0USDUSD$4true0mcd_ScheduleOfBenefitObligationsWeightedAverageAssumptionsLineItemsmcdfalsenadurationSchedule of Benefit Obligations Weighted Average Assumptions [Line Items]falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSchedule of Benefit Obligations Weighted Average Assumptions [Line Items]falsefalse5false0us-gaap_ShareBasedCompensationArrangementByShareBasedP aymentAwardFairValueAssumptionsExpectedDividendRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0350.035falsefalsefalsefalsefalse2truetruefalse0.0320.032falsefalsefalsefalsefalse3truetruefalse0.0260.026falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) falsefalse6false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1t ruetruefalse0.2210.221falsefalsefalsefalsefalse2truetruefalse0.2440.244falsefalsefalsefalsefalse3truetruefalse0.2490.249falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specifie d period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) falsefalse7false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruefalse0.0280.028falsefalsefalsefalsefalse2truetruefalse0.0200.020falsefalsefalsefalsefalse3truetruefalse0.0300.030falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe risk-free interest rate assumption that is used in valuing an option on its own shares.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) falsefalse8false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse6.26.2falsefalsefalsefalsefalse2truefalsefalse6.26.2falsefalsefalsefalsefalse3truefalsefalse6.26.2falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalThe period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous grou ps.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(a) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 falsefalse9false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValueus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1 truefalsefalse9.909.90falsetruefalsefalsefalse2truefalsefalse9.669.66falsetruefalsefalsefalse3truefalsefalse11.8511.85falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) falsetrue36Weighted-average assumptions (Detail) (USD $)UnKnownUnKnownNoRoundingUnKnowntruetrue