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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2023 EUR (€) | Jun. 30, 2023 JPY (¥) | Jun. 30, 2022 JPY (¥)
Derivative [Line Items] |  |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments |  | $ 0 | $ 0 | $ 0 |  |  |
Proceeds from net investment hedge terminations |  | 29 | 71 | 0 |  |  |
September 2018 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Proceeds from net investment hedge terminations | $ 19 |  |  |  |  |  |
March 2022 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Proceeds from net investment hedge terminations | 10 |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |
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
Foreign Currency Contracts |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax |  | 6 | (86) |  |  |  |
Interest Income (Expense), Nonoperating, Net |  | 16 | 21 |  |  |  |
Cash Flow Hedging |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivates, Hedge Discontinuances, Hedging Instrument Terminated, Amount |  |  |  | 200 |  |  |
Fair Value Hedging | Interest Rate Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | 1,100 | 1,100 | 800 |  |  |  |
Cash Flow Hedging | Foreign Currency Contracts |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | 376 | 376 | 327 |  |  |  |
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Notional Amount | 300 | 300 | 600 | 200 |  |  |
Derivates, Hedge Discontinuances, Hedging Instrument Terminated, Amount |  |  |  | $ 550 |  |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | September 2018 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount | 233 | 233 |  |  | € 200 |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2022 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount | 400 | 400 |  |  |  | ¥ 48,000 |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | September 2025 [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Notional Amount | 150 | 150 | 200 |  |  | 19,000 | 24,000
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2026 [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Notional Amount | 107 | 107 |  |  | 100 |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2025 [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Notional Amount | 107 | 107 |  |  | € 100 |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | June 2027 [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Notional Amount | $ 150 | $ 150 | $ 200 |  |  | ¥ 19,000 | ¥ 24,000

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