Financial Instruments (Schedule of Outstanding Instruments, Cash Flow Hedges) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Fair Value Hedging | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	$ 2,313	$ 1,813
Fair Value Hedging | Interest Rate Swaps | Minimum
Derivative [Line Items]
Maturity Date	Nov. 15, 2019	Jun. 15, 2018
Fair Value Hedging | Interest Rate Swaps | Maximum
Derivative [Line Items]
Maturity Date	Sep. 15, 2025	Sep. 15, 2025
Cash Flow Hedging | Foreign Currency Contracts
Derivative [Line Items]
Notional Amount	$ 124	$ 162
Cash Flow Hedging | Foreign Currency Contracts | Minimum
Derivative [Line Items]
Maturity Date	Jul. 15, 2018	Jul. 15, 2017
Cash Flow Hedging | Foreign Currency Contracts | Maximum
Derivative [Line Items]
Maturity Date	Jun. 15, 2019	Jun. 30, 2018
Cash Flow Hedging | Commodity Contracts
Derivative [Line Items]
Notional Amount	$ 12	$ 17
Cash Flow Hedging | Commodity Contracts | Minimum
Derivative [Line Items]
Maturity Date	Jul. 15, 2018	Jul. 07, 2017
Cash Flow Hedging | Commodity Contracts | Maximum
Derivative [Line Items]
Maturity Date	Oct. 15, 2020	Apr. 07, 2020
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	$ 1,050	$ 700
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Amount		600
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swaps
Derivative [Line Items]
Notional Amount		700
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Amount		$ 1,000