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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2025 USD ($) | Mar. 31, 2025 EUR (€) | Mar. 31, 2025 JPY (¥) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 JPY (¥) | Mar. 31, 2024 JPY (¥)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |
Proceeds from net investment hedge terminations |  |  | 2 | 28 |  |  |  |  |  |
January 2023 |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from net investment hedge terminations |  |  | 28 |  |  |  |  |  |  |
March 2025 |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Hedge, Financing Activities |  |  | 2 |  |  |  |  |  |  |
Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | (4) | (1) | 5 | 2 |  |  |  |  |  |
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | (2) | (3) | (4) |  |  |  |  |  |
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Forecast [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months |  |  |  |  | $ 1 |  |  |  |  |
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount |  | 500 |  | 500 |  |  |  |  |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax | (16) | (19) | (11) | (14) |  |  |  |  |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | (3) |  | (7) | (10) |  |  |  |  |  |
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 |  | 300 |  |  |  | ¥ 38,000 |  |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | September 2023 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | 120 |  | 120 |  |  |  | ¥ 18,000 |  |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | June 2027 |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 120 |  | $ 120 |  |  |  |  |  | ¥ 18,000
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | February 2027 |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | 105 |  | 105 |  |  | € 100 |  |  |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2025 |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | 107 |  | 107 |  |  | € 100 |  |  |  |
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 3 |  | $ (1) |  |  |  |  |  |  |

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