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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 JPY (¥) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€) | Jun. 30, 2018 USD ($)
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 | 600 |  | ¥ 64,000 | $ 233 | € 200 |
Foreign Currency Contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax | 35 | 12 |  |  |  |
Interest Income (Expense), Nonoperating, Net | 17 | 5 |  |  |  |
Fair Value Hedging | Interest Rate Swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount | 550 | 2,150 |  |  |  |
Cash Flow Hedging | Foreign Currency Contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount | 328 | 381 |  |  |  |
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 | $ 200 |  |  |  |  | $ 550
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | $ 200 |  |  |  |

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