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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