Financial Instruments and Fair Value Measurements, Summary of net investment hedges (Details) - Net investment hedging [Member] € in Millions, $ in Millions	6 Months Ended
Jun. 30, 2020 EUR (€)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)
Derivative [Member] \| Foreign currency contract [Member]
Derivative [Line Items]
Notional value	€ 617	$ 650	€ 617	$ 650
Expiration date	2027
Non-derivatives: [Member] \| Foreign-currency denominated debt [Member]
Derivative [Line Items]
Notional value	€ 750	$ 841	€ 750	$ 842
Expiration date	2022

Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant