Debt (Narrative) (Details) - Jun. 30, 2020 - Senior Notes $ in Millions, € in Billions	USD ($)	EUR (€)
Debt Instrument [Line Items]
Deferred financing charges and discounts	$ 45
Payable in U.S. Dollars
Debt Instrument [Line Items]
Aggregate principal amount	3,800
Payable in Euro
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,100	€ 1.0

Amount of unamortized debt discount (premium) and debt issuance costs.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant