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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2020 JPY (¥) | Mar. 31, 2020 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 |  |  |  |  |  | $ 200 |  |
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) |  |  |  |

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