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Financial Instruments (Narrative) (Details) - Interest Rate Swaps - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Fair Value Hedging |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 2,313 | $ 1,813
Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,050 | 700
Derivatives, terminated notional amounts |  | 600
Derivatives, matured notional amounts | $ 550 | 250
Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Derivative, notional amount |  | 700
Derivatives, terminated notional amounts |  | $ 1,000

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References 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 + Details
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