Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, £ in Millions, SFr in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 CHF (SFr)	Dec. 31, 2018 GBP (£)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 JPY (¥)	Aug. 31, 2018 USD ($)
Derivative [Line Items]
Average remaining maturity of foreign currency derivatives		12 months
Maximum remaining maturity of foreign currency derivatives (in days)		30 days
Foreign currency-denominated notes, designated as hedge			$ 3,700,000,000					$ 2,650,000,000
Variable rate (in percentage)					20.00%	20.00%	20.00%	20.00%	20.00%
Losses expected to be reclassified in the next 12 months								$ 15,000,000
Change on the fair value of contingent consideration		$ 215,900,000	203,900,000
Unrealized losses from equity securities		20,100,000
Other-than-temporary impairment losses recognized during the year		$ 0	0	$ 53,000,000
Percentage of nonperforming assets (in percentage)		55.00%
Amount derecognized			723,200,000					696,200,000
Buy USD Sell Euro
Derivative [Line Items]
Derivative liability, notional amount								785,500,000
Derivative asset, notional amount | €					€ 685.3
Buy euro Sell US dollar
Derivative [Line Items]
Derivative liability, notional amount | €					€ 2,050.0
Derivative asset, notional amount								2,350,000,000
Buy USD Sell Japanese Yen
Derivative [Line Items]
Derivative liability, notional amount								435,100,000
Derivative asset, notional amount | ¥									¥ 48,850
Buy Swiss francs Sell US dollar
Derivative [Line Items]
Derivative liability, notional amount | SFr						SFr 255.6
Derivative asset, notional amount								259,700,000
Buy US dollar Sell British pound
Derivative [Line Items]
Derivative liability, notional amount								388,300,000
Derivative asset, notional amount | £							£ 306.7
Buy GBP Sell USD
Derivative [Line Items]
Derivative liability, notional amount | £							£ 354.0
Derivative asset, notional amount								448,100,000
Currency Swap
Derivative [Line Items]
Derivative liability, notional amount								2,460,000,000
Interest rate swap
Derivative [Line Items]
Derivative asset, notional amount								350,000,000
Maximum remaining maturity of foreign currency derivatives (in days)		12 months
Foreign Currency Denominated Debt
Derivative [Line Items]
Long-term debt			3,700,000,000					3,400,000,000
Senior Notes
Derivative [Line Items]
Debt instrument, face amount										$ 2,000,000,000
Carrying Amount
Derivative [Line Items]
Long-term debt			$ 10,950,300,000					$ 12,272,000,000
Senior Notes Due August 27, 2021 | Senior Notes
Derivative [Line Items]
Debt instrument, face amount										$ 500,000,000
Stated interest rate (in percentage)										3.91%
Senior Notes Due August 28, 2023 | Senior Notes
Derivative [Line Items]
Debt instrument, face amount										$ 750,000,000
Stated interest rate (in percentage)										4.27%
Senior Notes Due August 28, 2028 | Senior Notes
Derivative [Line Items]
Debt instrument, face amount										$ 750,000,000
Stated interest rate (in percentage)										4.90%
Term Facility | Secured Debt
Derivative [Line Items]
Debt instrument, face amount	$ 500,000,000
Debt instrument, term (in years)	3 years