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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2025 EUR (€) | Jun. 30, 2025 JPY (¥) | Jun. 30, 2024 EUR (€) | Jun. 30, 2024 JPY (¥)
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments |  |  | $ 0 | $ 0 | $ 0 |  |  |  |
Proceeds from net investment hedge terminations |  |  | 2 | 34 | $ 29 |  |  |  |
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 |  |  |  |  |  |
March 2025 [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Hedge, Financing Activities |  |  | 2 |  |  |  |  |  |
Foreign Currency Contracts |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax |  |  | 33 | (26) |  |  |  |  |
Interest Income (Expense), Nonoperating, Net |  |  | 9 | 14 |  |  |  |  |
Fair Value Hedging | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | 1,600 |  |  |  |  |  |
Notional Amount | 1,600 |  | 1,600 | 1,600 |  |  |  |  |
Cash Flow Hedging | Currency Swap [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional Amount | 334 |  | 332 | 334 |  |  |  |  |
Cash Flow Hedging | Foreign Currency Contracts |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative, notional amount | 401 |  | 381 | 401 |  |  |  |  |
Notional Amount | 579 |  | 575 | 579 |  |  |  |  |
Cash Flow Hedging | Foreign Currency Contracts | Forecast | Subsequent Event |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months |  | $ 5 |  |  |  |  |  |  |
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount | 300 |  | 500 | 300 |  |  |  |  |
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 |  |  |  |  | 19,000
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 |
Notional Amount |  |  | 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 |  |  |  |  | ¥ 19,000
Notional Amount |  |  | 120 |  |  |  | ¥ 18,000 |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | February 2027 |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional Amount |  |  | $ 105 |  |  | € 100 |  |  |

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