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Goodwill and Intangible Assets Intangible Assets (Details) (USD $)	9 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 24, 2011	Dec. 25, 2010	Sep. 24, 2011 Brands years	Dec. 25, 2010 Brands years	Sep. 24, 2011 Distribution rights years	Dec. 25, 2010 Distribution rights years	Sep. 24, 2011 Patents and technology and distribution channels years	Dec. 25, 2010 Patents and technology and distribution channels years	Sep. 24, 2011 Land use rights and other years	Dec. 25, 2010 Land use rights and other years	Sep. 24, 2011 Distribution networks	Dec. 25, 2010 Distribution networks	Sep. 24, 2011 Other, intangible	Dec. 25, 2010 Other, intangible	Mar. 26, 2011 Sharp's Brewery Ltd. in U.K.
Details of intangible assets, other than goodwill:
Total Gross	$ 4,995,900,000	$ 5,061,900,000
Total Net	4,566,000,000	4,655,100,000
Intangible assets subject to amortization:
Useful life - minimum (in years)			3	3	2	2	3	3	2	2
Useful life - maximum (in years)			40	40	23	23	10	10	42	42
Gross			315,000,000	297,300,000	339,700,000	345,800,000	34,700,000	34,600,000	6,400,000	6,200,000
Accumulated amortization	(429,900,000)	(406,800,000)	(172,600,000)	(159,600,000)	(228,600,000)	(221,600,000)	(28,000,000)	(25,500,000)	(700,000)	(100,000)
Net			142,400,000	137,700,000	111,100,000	124,200,000	6,700,000	9,100,000	5,700,000	6,100,000
Intangible assets not subject to amortization:
Indefinite-lived intangible assets			3,300,600,000	3,359,200,000							984,000,000	1,003,300,000	15,500,000	15,500,000
Changes in the gross carrying amounts of intangibles															20,400,000
Impairment charge associated with Molson brands intangible asset	0
Goodwill, Impaired, Accumulated Impairment Loss	$ 0