Debt Obligations (Narrative) (Details) € in Millions, ¥ in Millions, £ in Millions, CAD in Millions			3 Months Ended			12 Months Ended
	Mar. 15, 2017 USD ($)	Jul. 07, 2016 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CAD	Dec. 29, 2012 USD ($)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 CAD	Dec. 31, 2017 JPY (¥)	Mar. 15, 2017 EUR (€)	Oct. 11, 2016 USD ($)	Jul. 07, 2016 CAD	Jul. 07, 2016 EUR (€)	Sep. 18, 2015 CAD	Mar. 31, 2015 USD ($)	Mar. 31, 2015 EUR (€)	Jun. 30, 2014 CAD	May 03, 2012 USD ($)	Oct. 06, 2010 CAD
Debt Instrument [Line Items]
Leverage Ratio Following Acquisition						5.75x
Other income (expense), net						$ (100,000)	$ (29,700,000)	$ 900,000
Debt Instrument, Interest Rate Terms	0.35% plus three-month EURIBOR
Derivative, Cash Received on Hedge								16,000,000
Derivative, Notional Amount																			$ 300,000,000
Other short-term borrowings			$ 7,400,000			7,400,000	13,100,000
Line of Credit Facility, Remaining Borrowing Capacity			1,100,000,000			1,100,000,000
Commercial Paper			379,000,000			379,000,000	0
Bank Overdrafts			1,200,000			1,200,000	2,600,000
Cash Held in Bank			37,800,000			37,800,000	18,000,000
Cash Held in Bank, Net of Bank Overdrafts			$ 36,600,000			$ 36,600,000	15,400,000
Leverage Ratio In Fourth Year Following Acquisition						3.75x
July 15, 2019 through July 15, 2046 [Member]
Debt Instrument [Line Items]
Senior Notes		$ 5,300,000,000
Maturing July 15, 2024 [Member]
Debt Instrument [Line Items]
Senior Notes | €																	€ 800.0
Maturing July 15, 2023 and July 15, 2026 [Member]
Debt Instrument [Line Items]
Senior Notes | CAD																CAD 1,000.0
$500 million 2.25% notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			1.83%			1.83%					1.83%	1.83%	1.83%
Two Thousand Seventeen Notes [Member]
Debt Instrument [Line Items]
Underwriting Fees Related to Long-term Debt	$ 3,100,000
Debt Instrument, Unamortized Discount	700,000
Three Year Tranche [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						1.50%
Debt Instrument, Face Amount					$ 3,000,000,000			$ 3,000,000,000
Revolving Multicurrency Bank Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							750,000,000
Line Of Credit YEN [Member]
Debt Instrument [Line Items]
Short-term Debt			$ 3,200,000			$ 3,200,000	7,000,000
$300 million 2.0% notes due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage					0.95%			0.95%
$500 million 3.5% notes due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage					1.57%			1.57%
CAD 500 million 2.75% Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Term								5 years	5 years
CAD 400 million 2.25% Notes Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Term								3 years	3 years
Two Thousand Sixteen Notes [Member]
Debt Instrument [Line Items]
Underwriting Fees Related to Long-term Debt		36,500,000
Debt Instrument, Unamortized Discount		17,700,000
Debt Issuance Cost	6,100,000	65,000,000
Proceeds from Debt, Net of Issuance Costs		$ 6,900,000,000
Overdraft facility and Line of Credit (GBP) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						1.50%
Line of Credit Facility, Maximum Borrowing Capacity | £											£ 20
Line of Credit Facility, Interest Rate Description						GBP LIBOR plus 1.5%
GBP Overdraft Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | £											10
Uncommitted money market facility (GBP) [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | £											£ 10
Line Of Credit CAD [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | CAD												CAD 30.0
Line of Credit Facility, Interest Rate Description						USD Prime or CAD Prime
Overdraft Facility YEN 900M [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						0.45%
Line of Credit Facility, Maximum Borrowing Capacity | ¥													¥ 900
Line of Credit Facility, Interest Rate Description						Japan base rate plus 0.45%
Overdraft Facility YEN 500M [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						0.35%
Line of Credit Facility, Maximum Borrowing Capacity | ¥													¥ 500
Line of Credit Facility, Interest Rate Description						Japan base rate plus 0.35%
Two Thousand Seventeen USD Notes [Member]
Debt Instrument [Line Items]
Senior Notes	1,500,000,000
Proceeds from Debt, Net of Issuance Costs	1,500,000,000
$500 million 1.90% notes due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			1.65%			1.65%					1.65%	1.65%	1.65%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount																						$ 1,900,000,000
Proceeds from issuances of long-term debt										$ 1,900,000,000
Underwriting Fees Related to Long-term Debt										14,700,000
Discounts to Long-term Debt										$ 4,600,000
Debt Issuance Costs, Capitalized																						18,000,000
Senior Notes [Member] | $500 million 2.25% notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000,000
Liabilities, Fair Value Adjustment			$ (1,900,000)
Debt instrument, interest rate percentage	2.25%													2.25%
Debt Instrument, Increase (Decrease) in Effective Cost of Borrowing						0.17%
Senior Notes [Member] | Two Thousand Seventeen EUR Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount | €														€ 500.0
Senior Notes [Member] | $300 million 2.0% notes due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount																						$ 300,000,000
Derivative, Cash Received on Hedge								$ 700,000
Liabilities, Fair Value Adjustment								700,000
Debt instrument, interest rate percentage																						2.00%
Derivative, Notional Amount																			$ 300,000,000	€ 265.0
Debt Instrument, Increase (Decrease) in Effective Cost of Borrowing						0.16%
Senior Notes [Member] | $500 million 3.5% notes due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount																						$ 500,000,000
Derivative, Cash Received on Hedge								18,100,000
Liabilities, Fair Value Adjustment					$ 18,100,000			7,300,000
Debt instrument, interest rate percentage																						3.50%
Debt Instrument, Increase (Decrease) in Effective Cost of Borrowing						0.56%
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%
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%
Debt Instrument, Increase (Decrease) in Effective Cost of Borrowing						0.65%
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%
Debt Instrument, Increase (Decrease) in Effective Cost of Borrowing						0.16%
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%
Senior Notes [Member] | Two Thousand Seventeen USD Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,000,000,000
Senior Notes [Member] | $500 million 1.90% notes due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000,000
Liabilities, Fair Value Adjustment			$ (1,600,000)
Debt instrument, interest rate percentage	1.90%													1.90%
Debt Instrument, Increase (Decrease) in Effective Cost of Borrowing						0.24%
Forward Starting Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount | CAD																					CAD 600.0
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion								29,500,000	CAD 39.2
Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate			1.84%			1.84%					1.84%	1.84%	1.84%
Weighted Average Interest Rate, Term						45 days
Interest Income [Member] | Millercoors [Member]
Debt Instrument [Line Items]
Interest Income, Deposits with Financial Institutions							(19,000,000)	$ 0
Lenders Party Thereto and Citibank [Member] | Millercoors [Member] | Three Year Tranche [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount															$ 2,500,000,000
Lenders Party Thereto and Citibank [Member] | Millercoors [Member] | Three Year Tranche [Member] | Three Year Tranche [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount															1,000,000,000
Lenders Party Thereto and Citibank [Member] | Millercoors [Member] | Five Year Tranche [Member] | Three Year Tranche [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount															$ 1,500,000,000
Lenders Party Thereto and Citibank [Member] | Interest expense, net | Millercoors [Member] | Three Year Tranche [Member]
Debt Instrument [Line Items]
Debt Issuance Cost							$ 8,700,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,500,000,000			$ 1,500,000,000
Debt Instrument, Term				5 years