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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 JPY (¥) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€) | Jun. 30, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | $ 0 | $ 0 |  |  |  |
Interest Rate Swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge | 18 |  |  |  |  |
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 | 7 | 35 |  |  |  |
Interest Income (Expense), Nonoperating, Net | 19 | 17 |  |  |  |
Cash Flow Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Liability, Notional Amount |  | 200 |  |  |  |
Derivates, Hedge Discontinuances, Hedging Instrument Terminated, Amount | 200 |  |  |  |  |
Fair Value Hedging | Interest Rate Swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount | 200 | 550 |  |  |  |
Cash Flow Hedging | Foreign Currency Contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount | 436 | 328 |  |  |  |
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Liability, Notional Amount | 200 |  |  |  |  |
Derivatives, matured notional amounts |  | 200 |  |  |  |
Derivates, Hedge Discontinuances, Hedging Instrument Terminated, Amount | $ 550 |  |  |  |  |
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge |  | $ 112 |  |  |  |
Derivatives, terminated notional amounts |  |  |  |  |  | $ 163

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