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Financial Instruments - Interest Rate Risk (Details) € in Millions, kr in Millions, SFr in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) numberOfDerivatives	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) numberOfDerivatives	Sep. 30, 2019 USD ($)	Sep. 30, 2020 EUR (€) numberOfDerivatives	Sep. 30, 2020 CHF (SFr) numberOfDerivatives	Sep. 30, 2020 DKK (kr) numberOfDerivatives	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2019 DKK (kr)
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			(27,000,000)	28,000,000
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	1,706,000,000		1,706,000,000						$ 1,364,000,000
Foreign currency forward-exchange contracts	0	$ 1,000,000	10,000,000	5,000,000
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	$ (30,000,000)	$ 23,000,000	$ (27,000,000)	$ 28,000,000
Derivatives Designated as Hedging Instruments: \| Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative instruments	550,000,000		550,000,000						250,000,000
Derivatives Designated as Hedging Instruments: \| Treasury locks
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 600,000,000		$ 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%
Senior Notes \| Senior notes 2.000% due 2030
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate percentage	2.00%		2.00%		2.00%	2.00%	2.00%
Senior Notes \| Senior Notes 3.000% due 2050
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate percentage	3.00%		3.00%		3.00%	3.00%	3.00%