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Debt Schedule of Debt Obligations (Details) € in Millions, CAD in Millions	Dec. 31, 2017 USD ($)	Mar. 15, 2017 USD ($)	Mar. 15, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Oct. 11, 2016 USD ($)	Jul. 07, 2016 USD ($)	Jul. 07, 2016 CAD	Jul. 07, 2016 EUR (€)	Dec. 31, 2015 USD ($)	Sep. 18, 2015 CAD	May 03, 2012 USD ($)	Oct. 06, 2010 CAD
Debt Instrument [Line Items]
Less: unamortized debt discounts and debt issuance costs	$ (75,900,000)			$ (85,000,000)
Total long-term debt (including current portion)	10,927,100,000			12,059,400,000
Less: current portion of long-term debt	328,400,000			671,700,000
Total long-term debt	10,598,700,000			11,387,700,000
Commercial Paper	379,000,000			0
Cash pool overdrafts(7)	1,200,000			2,600,000
Other short-term borrowings	7,400,000			13,100,000
Current portion of long-term debt and short-term borrowings	714,800,000			684,800,000
MillerCoors Acquisition Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 3,000,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 1,900,000,000
Senior Notes [Member] \| Series A notes due 2017 CAD 500 million 3.95% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| CAD												CAD 500.0
Debt instrument, interest rate percentage												3.95%
Long-term debt, gross	0			372,000,000
Senior Notes [Member] \| CAD 400 million 2.25% Notes Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| CAD										CAD 400.0
Debt instrument, interest rate percentage										2.25%
Long-term debt, gross	318,200,000			297,600,000
Senior Notes [Member] \| CAD 500 million 2.75% Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| CAD										CAD 500.0
Debt instrument, interest rate percentage										2.75%
Long-term debt, gross	397,700,000			372,000,000
Senior Notes [Member] \| CAD 500 million 2.84% notes due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| CAD							CAD 500.0
Debt instrument, interest rate percentage						2.84%	2.84%	2.84%
Long-term debt, gross	397,700,000			372,000,000
Senior Notes [Member] \| CAD 500 million 3.44% notes due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| CAD							CAD 500.0
Debt instrument, interest rate percentage						3.44%	3.44%	3.44%
Long-term debt, gross	397,700,000			372,000,000
Senior Notes [Member] \| $300 million 2.0% notes due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 300,000,000
Debt instrument, interest rate percentage											2.00%
Long-term debt, gross	0			300,200,000
Senior Notes [Member] \| $500 million 1.45% notes due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 500,000,000
Debt instrument, interest rate percentage						1.45%	1.45%	1.45%
Long-term debt, gross	500,000,000			500,000,000
Senior Notes [Member] \| $500 million 1.90% notes due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500,000,000
Debt instrument, interest rate percentage		1.90%	1.90%
Long-term debt, gross	498,500,000			0
Senior Notes [Member] \| $500 million 2.25% notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500,000,000
Debt instrument, interest rate percentage		2.25%	2.25%
Long-term debt, gross	498,200,000			0
Senior Notes [Member] \| $1.0 billion 2.10% notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 1,000,000,000
Debt instrument, interest rate percentage						2.10%	2.10%	2.10%
Long-term debt, gross	1,000,000,000			1,000,000,000
Senior Notes [Member] \| $500 million 3.5% notes due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 500,000,000
Debt instrument, interest rate percentage											3.50%
Long-term debt, gross	512,200,000			515,000,000
Senior Notes [Member] \| $2.0 billion 1.45% notes due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	2,000,000,000			2,000,000,000
Senior Notes [Member] \| $1.1 billion 5.0% notes due 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 1,100,000,000
Debt instrument, interest rate percentage											5.00%
Long-term debt, gross	1,100,000,000			1,100,000,000
Senior Notes [Member] \| $1.8 billion 4.2% notes due 2046 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 1,800,000,000
Debt instrument, interest rate percentage						4.20%	4.20%	4.20%
Long-term debt, gross	1,800,000,000			1,800,000,000
Senior Notes [Member] \| Two Thousand Seventeen EUR Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| €			€ 500.0
Long-term debt, gross	600,300,000			0
Senior Notes [Member] \| EUR 800 million 1.25% notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| €								€ 800.0
Debt instrument, interest rate percentage						1.25%	1.25%	1.25%
Long-term debt, gross	960,400,000			841,400,000
Senior Notes [Member] \| $2.0 billion 3.0% notes due 2026 [Member] [Domain]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 2,000,000,000
Debt instrument, interest rate percentage						3.00%	3.00%	3.00%
Term Loan \| MillerCoors Acquisition Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0			2,300,000,000
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 22,100,000			2,200,000
Lenders Party Thereto and Citibank [Member] \| Millercoors [Member] \| MillerCoors Acquisition Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 2,500,000,000
Interest expense, net \| Lenders Party Thereto and Citibank [Member] \| Millercoors [Member] \| MillerCoors Acquisition Term Loan [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Gross				$ 8,700,000