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Financial Instruments Narrative (Details) ¥ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 JPY (¥) | Sep. 30, 2023 JPY (¥)
Derivative [Line Items] |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | $ 0 |  |  |  |  |
Proceeds from net investment hedge terminations | 0 | $ 28 |  |  |  |
January 2023 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Proceeds from net investment hedge terminations |  | 28 |  |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax | (22) | 11 |  |  |  |
Interest Income (Expense), Nonoperating | 2 | 3 |  |  |  |
Cash Flow Hedging [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax | 3 |  |  |  |  |
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 1 | 1 |  |  |  |
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] |  |  |  |  |  |
Notional Amount |  | 100 |  |  |  |
Designated as Hedging Instrument | Net Investment Hedging | 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 | Currency Swap [Member] | September 2025 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Asset, Notional Amount |  | 120 |  |  |  | 18,000
Derivatives, Hedge Discontinuances, Termination of Hedging Instrument, Notional Amount |  |  |  | $ 120 | ¥ 18,000 |
Designated as Hedging Instrument | Net Investment Hedging | Currency Swap [Member] | June 2027 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Asset, Notional Amount |  | $ 120 |  |  |  | ¥ 18,000
Other Nonoperating Income (Expense) | Not Designated as Hedging Instrument | Foreign Exchange Contract [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (1) |  |  |  |  |

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