Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

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The number of derivative instruments of a particular group held by the entity.

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Financial Instruments - Interest Rate Risk (Details) € in Millions, SFr in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) swap	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) swap	Jun. 30, 2018 USD ($)	Jun. 30, 2019 EUR (€) swap	Jun. 30, 2019 CHF (SFr) swap	Dec. 31, 2018 USD ($) swap	Dec. 31, 2018 EUR (€) swap	Jan. 28, 2013
Cross-currency interest rate swap contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount					€ 507	SFr 25		€ 400
Derivatives Not Designated as Hedging Instruments \| Foreign currency forward-exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 1,200		$ 1,200				$ 1,300
Foreign currency forward-exchange contracts	8	$ 10	4	$ 0
Derivatives Designated as Hedging Instruments: \| Cross-currency interest rate swap contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrecognized net gains/(losses) on cross-currency interest rate swap contracts, recorded, net of tax	$ (4)	$ 1	$ 14	$ 1
Derivatives Designated as Hedging Instruments: \| Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Number of Instruments Held \| swap	0		0		0	0	0	0
Senior Notes \| Senior notes due 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate percentage									1.875%