Financial Instruments (Schedule of Gain/(Loss) Included in AOCI for Derivative Instruments Designated as Cash Flow Hedges) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Document Period End Date	Jun. 30, 2017
Cash Flow Hedging | Interest Rate Swaps
Derivative [Line Items]
Gain/(loss) included in AOCI for derivative instruments designated as cash flow hedges	$ 0	$ (10)
Cash Flow Hedging | Commodity Contracts
Derivative [Line Items]
Gain/(loss) included in AOCI for derivative instruments designated as cash flow hedges	(1)	(3)
Cash Flow Hedging | Foreign Currency Contracts
Derivative [Line Items]
Gain/(loss) included in AOCI for derivative instruments designated as cash flow hedges	$ 0	$ (4)