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Income Taxes (Narrative) (One-time Transaction) (Details) $ in Millions, ₨ in Billions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2017 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2013 USD ($) | Jul. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jan. 08, 2024 USD ($) | Jun. 30, 2018 INR (₨) | Apr. 30, 2018 INR (₨)
One-time Transaction [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  | $ 197 | $ 165 |  | $ 410 | $ 344 |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |
One-time Transaction [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Anticipated non-cash tax expense from OBBBA | $ 400 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
One-time Transaction [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax asset, research and experimental |  |  |  |  |  |  |  | $ 400 |  |  |  |
Indian Income Tax Department (ITD) | Foreign tax authority | 2013 India Share Repurchase |  |  |  |  |  |  |  |  |  |  |  |
One-time Transaction [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Foreign earnings repatriated |  |  |  |  |  |  | $ 523 |  |  |  |  |
Indian Income Tax Department (ITD) | Foreign tax authority | 2016 India Cash Remittance |  |  |  |  |  |  |  |  |  |  |  |
One-time Transaction [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Foreign earnings repatriated |  |  |  | $ 2,800 |  |  |  |  |  |  |  |
Income tax expense |  |  |  | $ 135 |  |  |  |  |  |  |  |
Income tax, disputed amount |  | 385 |  |  | 385 |  |  |  |  |  | ₨ 33 |
Deposits assets | ₨ |  |  |  |  |  |  |  |  |  |  |  | ₨ 5
Desposits assets, percent disputed tax amount |  |  |  |  |  |  |  |  |  |  |  | 15.00%
Indian Income Tax Department (ITD) | Foreign tax authority | 2016 India Cash Remittance | Long-term investments |  |  |  |  |  |  |  |  |  |  |  |
One-time Transaction [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted investments |  |  |  |  |  |  |  |  |  | $ 30,000 |  |
Indian Income Tax Department (ITD) | Foreign tax authority | 2016 India Cash Remittance | Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |  |
One-time Transaction [Table] [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deposits assets |  | $ 403 |  |  | $ 403 |  |  |  | $ 403 |  |  |

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