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Financial Instruments - Interest Rate Risk (Details) € in Millions, SFr in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) swap	Mar. 31, 2018 USD ($)	Mar. 31, 2019 CHF (SFr) swap	Mar. 31, 2019 EUR (€) 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			SFr 25	€ 507		€ 400
Derivatives Not Designated as Hedging Instruments \| Foreign currency forward-exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 1,100				$ 1,300
Foreign currency forward-exchange contracts	(4)	$ 10
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	$ 18	$ 0
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
Senior Notes \| Senior notes due 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate percentage							1.875%