Financial Instruments (Schedule of Outstanding Instruments, Cash Flow Hedges) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Cash Flow Hedging
Derivative [Line Items]
Derivative Liability, Notional Amount	$ 200
Fair Value Hedging | Interest Rate Swaps
Derivative [Line Items]
Notional Amount	550	$ 2,150
Cash Flow Hedging | Foreign Currency Contracts
Derivative [Line Items]
Notional Amount	328	381
Cash Flow Hedging | Commodity Contracts
Derivative [Line Items]
Notional Amount	$ 16	20
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swaps
Derivative [Line Items]
Notional Amount			$ 1,100
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Amount		163
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swaps
Derivative [Line Items]
Notional Amount		$ 200