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Financial Instruments (Narrative) (Details)
€ in Millions, ¥ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
JPY (¥)
Dec. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Derivative [Line Items]                
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments $ 0 $ 0   $ 0        
Cash Flow Hedging [Member]                
Derivative [Line Items]                
Derivative Liability, Notional Amount           $ 100    
Currency Swap [Member]                
Derivative [Line Items]                
Derivative Liability, Notional Amount         ¥ 64,000 600 $ 233 € 200
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap                
Derivative [Line Items]                
Derivatives, Hedge Discontinuances, Hedging Instrument Matured, Amount           $ 200    
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]                
Derivative [Line Items]                
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net     $ (7) $ (8)