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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, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 JPY (¥) | Mar. 31, 2023 JPY (¥) | Mar. 31, 2023 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Proceeds from net investment hedge terminations |  |  | 28 | 29 |  |  |  |
Effective March 2022 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Proceeds from net investment hedge terminations |  | 10 |  |  |  |  |  |
Effective September 2018 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Proceeds from net investment hedge terminations |  | 19 |  |  |  |  |  |
January 2023 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Proceeds from net investment hedge terminations |  |  | 28 |  |  |  |  |
Cash Flow Hedging [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 1 | 2 | 2 | 4 |  |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax | 19 |  | 14 | 21 |  |  |  |
Interest Income (Expense), Nonoperating, Net | 3 | 4 | 10 | 12 |  |  |  |
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 2 | 4 | 4 | 8 |  |  |  |
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Forecast [Member] | Subsequent Event |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  |  |  | $ 3 |  |  |
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Swap |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount | 500 | 200 | 500 | 200 |  |  |  |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | Effective 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] | Effective 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] | 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 2025 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount | 120 | 150 | 120 | 150 |  | 18,000 | 19,000 |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | June 2027 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount | $ 120 | 150 | $ 120 | 150 |  | ¥ 18,000 | ¥ 19,000 |
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2025 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | 107 |  | 107 |  |  |  | 100
Designated as Hedging Instrument | Net Investment Hedging [Member] | Currency Swap [Member] | March 2026 |  |  |  |  |  |  |  |
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 |  |  |  |

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