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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2024 JPY (¥) | Jun. 30, 2023 JPY (¥) | Jun. 30, 2023 EUR (€) | 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 |  | 34 | 29 | 71 |  |  |  |
September 2018 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Proceeds from net investment hedge terminations | $ 19 |  |  |  |  |  |  |
March 2022 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Proceeds from net investment hedge terminations | 10 |  |  |  |  |  |  |
January 2023 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Proceeds from net investment hedge terminations |  | 28 |  |  |  |  |  |
June 2027 [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Proceeds from net investment hedge terminations |  | 6 |  |  |  |  |  |
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 |  | 26 | (6) |  |  |  |  |
Interest Income (Expense), Nonoperating, Net |  | 14 | 16 |  |  |  |  |
Fair Value Hedging | Interest Rate Swap |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, notional amount | 1,100 | 1,600 | 1,100 |  |  |  |  |
Notional Amount | 1,100 | 1,600 | 1,100 |  |  |  |  |
Cash Flow Hedging | Currency Swap [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional Amount | 514 | 334 | 514 |  |  |  |  |
Cash Flow Hedging | Foreign Currency Contracts |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, notional amount | 376 | 401 | 376 |  |  |  |  |
Notional Amount | 513 | 579 | 513 |  |  |  |  |
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount | 300 | 500 | 300 | 600 |  |  |  |
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] | January 2023 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount |  | 300 |  |  | ¥ 38,000 |  |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | June 2027 [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount |  | 120 |  |  | 18,000 |  |  |
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
Notional Amount |  | 120 |  |  | 18,000 |  |  |
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
Notional Amount |  | $ 120 |  |  | ¥ 18,000 |  |  |

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