Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014
Derivative [Line Items]
Loss on Extinguishment of Debt	$ 0	$ 60	$ 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
Designated as Hedging Instrument | Fair Value Hedging [Member] | Interest Rate Swaps
Derivative [Line Items]
Derivative, notional amount	$ 300	450	$ 300	450
Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swaps
Derivative [Line Items]
Derivative, notional amount					$ 50
Deb Redemption [Member] | Designated as Hedging Instrument | Fair Value Hedging [Member] | Interest Rate Swaps
Derivative [Line Items]
Derivative, notional amount		$ 875		$ 875