Contractual interest rate for funds borrowed, under the debt agreement.

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Financial Instruments - Foreign Exchange Risk (Details) € in Millions, kr in Millions, SFr in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2020 CHF (SFr)	Sep. 30, 2020 DKK (kr)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2019 DKK (kr)
Senior Notes \| Senior notes due 2018
Derivative [Line Items]
Interest rate percentage	3.90%	3.90%	3.90%	3.90%
Cross-currency interest rate swap contracts
Derivative [Line Items]
Derivative notional amount	$ 150	€ 650	SFr 25	kr 600	$ 150	€ 650	SFr 25	kr 600
Derivatives Not Designated as Hedging Instruments \| Foreign Exchange Contract
Derivative [Line Items]
Derivative notional amount	$ 1,706				$ 1,364
Maturity period (in days)	60 days
Derivatives Not Designated as Hedging Instruments \| Maximum \| Foreign Exchange Contract
Derivative [Line Items]
Maturity period (in days)	3 years