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Debt Schedule (Details) € in Millions	Sep. 30, 2016 USD ($)	Jul. 07, 2016 CAD	Jul. 07, 2016 USD ($)	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	$ (82,500,000)				$ (21,300,000)
Total long-term debt (including current portion)	9,860,600,000				2,908,700,000
Current portion of long-term debt	(299,900,000)				0
Total long-term debt	9,560,700,000				2,908,700,000
Overdraft facility	400,000				18,700,000
Short-term facilities	10,900,000				7,500,000
Other short-term borrowings	15,700,000				2,500,000
Current portion of long-term debt and short-term borrowings	326,900,000				28,700,000
Credit facilities [Member] \| Japanese Yen [Member]
Debt Instrument [Line Items]
Short-term facilities	10,900,000				7,500,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 1,900,000,000
Senior Notes [Member] \| CAD 500 million 3.95% Series A notes due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	380,900,000				361,300,000
Debt Instrument, Face Amount \| CAD								CAD 500,000,000
Debt instrument, interest rate percentage								3.95%
Senior Notes [Member] \| CAD 400 million 2.25% notes due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	304,700,000				289,000,000
Debt Instrument, Face Amount \| CAD						CAD 400,000,000
Debt instrument, interest rate percentage						2.25%
Senior Notes [Member] \| CAD 500 million 2.75% notes due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	380,900,000				361,300,000
Debt Instrument, Face Amount \| CAD						CAD 500,000,000
Debt instrument, interest rate percentage						2.75%
Senior Notes [Member] \| CAD 500 million 2.84% notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	380,900,000				0
Debt Instrument, Face Amount \| CAD		CAD 500,000,000
Debt instrument, interest rate percentage		2.84%	2.84%	2.84%
Senior Notes [Member] \| CAD 500 million 3.44% notes due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	380,900,000				0
Debt Instrument, Face Amount \| CAD		CAD 500,000,000
Debt instrument, interest rate percentage		3.44%	3.44%	3.44%
Senior Notes [Member] \| $300 million 2.0% notes due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	300,300,000				300,600,000
Debt Instrument, Face Amount							$ 300,000,000
Debt instrument, interest rate percentage							2.00%
Senior Notes [Member] \| $500 million 1.45% notes due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	500,000,000				0
Debt Instrument, Face Amount			$ 500,000,000
Debt instrument, interest rate percentage		1.45%	1.45%	1.45%
Senior Notes [Member] \| $1.0 billion 2.10% notes due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,000,000,000				0
Debt Instrument, Face Amount			$ 1,000,000,000
Debt instrument, interest rate percentage		2.10%	2.10%	2.10%
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
Senior Notes [Member] \| $500 million 3.5% notes due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	515,700,000				517,800,000		$ 500,000,000
Debt Instrument, Face Amount							$ 500,000,000
Debt instrument, interest rate percentage							3.50%
Senior Notes [Member] \| $2.0 billion 1.45% notes due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	2,000,000,000				0
Debt instrument, interest rate percentage		3.00%	3.00%	3.00%
Senior Notes [Member] \| $1.1 billion 5.0% notes due 2042 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,100,000,000				1,100,000,000
Debt Instrument, Face Amount							$ 1,100,000,000.0
Debt instrument, interest rate percentage							5.00%
Senior Notes [Member] \| $1.8 billion 4.2% notes due 2046 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,800,000,000				0
Debt Instrument, Face Amount			$ 1,800,000,000
Debt instrument, interest rate percentage		4.20%	4.20%	4.20%
Senior Notes [Member] \| EUR 800 million 1.25% notes due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying amount	$ 898,800,000				$ 0
Debt Instrument, Face Amount \| €				€ 800
Debt instrument, interest rate percentage		1.25%	1.25%	1.25%