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Financial Instruments (Narrative) (Details)
€ in Millions, $ in Millions
12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
EUR (€)
Derivative [Line Items]      
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments $ 0 $ 0  
Currency Swap [Member]      
Derivative [Line Items]      
Derivative Liability, Notional Amount | €     € 200
Fair Value Hedging | Interest Rate Swaps      
Derivative [Line Items]      
Derivative, notional amount 2,150 2,313  
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swaps      
Derivative [Line Items]      
Derivative, notional amount   1,100  
Derivatives, terminated notional amounts $ 163    
Derivatives, matured notional amounts   $ 550