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Financial Instruments - Interest Rate Risk (Details) € in Millions, kr in Millions, SFr in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) numberOfDerivatives	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) numberOfDerivatives	Jun. 30, 2019 USD ($)	Jun. 30, 2020 EUR (€) numberOfDerivatives	Jun. 30, 2020 CHF (SFr) numberOfDerivatives	Jun. 30, 2020 DKK (kr) numberOfDerivatives	Dec. 31, 2019 USD ($) swap	Dec. 31, 2019 EUR (€) swap	Dec. 31, 2019 CHF (SFr) swap	Dec. 31, 2019 DKK (kr) swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Payment for settlement			$ 6,000,000	$ 0
Unrecognized net gains/(losses) on cross-currency interest rate swap contracts, recorded, net of tax			3,000,000	4,000,000
Cross-currency interest rate swap contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 150,000,000		150,000,000		€ 650	SFr 25	kr 600	$ 150,000,000	€ 650	SFr 25	kr 600
Derivatives Not Designated as Hedging Instruments \| Foreign currency forward-exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount	1,550,000,000		1,550,000,000					$ 1,364,000,000
Foreign currency forward-exchange contracts	4,000,000	$ 8,000,000	10,000,000	4,000,000
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	$ (14,000,000)	$ (4,000,000)	$ 3,000,000	$ 14,000,000
Derivatives Designated as Hedging Instruments: \| Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative instruments	450,000,000		450,000,000					0	0	0	0
Derivatives Designated as Hedging Instruments: \| Treasury locks
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 600,000,000		$ 600,000,000
Payment for settlement	6,000,000
Senior notes 2.000% due 2030 \| Derivatives Designated as Hedging Instruments: \| Treasury locks
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 425,000,000		$ 425,000,000
Number of derivative instruments \| numberOfDerivatives	4		4		4	4	4
Senior Notes 3.000% due 2050 \| Derivatives Designated as Hedging Instruments: \| Treasury locks
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 175,000,000		$ 175,000,000
Number of derivative instruments \| numberOfDerivatives	2		2		2	2	2
Senior Notes \| Senior notes due 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate percentage	3.90%		3.90%		3.90%	3.90%	3.90%
Senior Notes \| 3.250% 2013 senior notes due 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate percentage	3.25%		3.25%		3.25%	3.25%	3.25%