Financial Instruments (Schedule of Outstanding Instruments, Fair Value Hedges) (Details) - Fair Value Hedging - Interest Rate Swaps - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Derivative [Line Items]
Notional Amount	$ 2,313	$ 1,813
Minimum
Derivative [Line Items]
Maturity Date	Nov. 15, 2019	Jun. 15, 2018
Maximum
Derivative [Line Items]
Maturity Date	Sep. 15, 2025	Sep. 15, 2025
Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	$ 1,050	$ 700

Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: 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

Reference 2: 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 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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