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Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Jun. 30, 2015
Derivative [Line Items] |  |  |  |  |
Loss on Extinguishment of Debt | $ 0 | $ 0 | $ 0 | $ 60 |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  |  | 37 |
Payments of Debt Extinguishment Costs |  |  |  | 80 |
Write off of Deferred Debt Issuance Cost |  |  |  | 2 |
Fair value adjustment due to termination of interest rate swap |  |  |  | 22 |
Interest Rate Swap [Member] | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 200 | 50 | 200 | 50 |
Interest Rate Swap [Member] | Designated as Hedging Instrument | Fair Value Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | $ 300 | 700 | $ 300 | 700 |
Debt Offering [Member] | Designated as Hedging Instrument | Fair Value Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount |  | 450 |  | 450 |
Debt Redemption [Member] | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount |  | $ 350 |  | $ 350 |
Debt Redemption [Member] | Designated as Hedging Instrument | Fair Value Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 875

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 + Details
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