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Income Taxes (Narrative) (One-time Transaction) (Details) $ in Millions, ₨ in Billions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2013 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2024 USD ($) | Jan. 08, 2024 USD ($) | Apr. 30, 2018 INR (₨) | Mar. 31, 2018 INR (₨)
One-time Transaction [Table] [Line Items] |  |  |  |  |  |  |  |
Income tax expense | $ 213 | $ 179 |  |  |  |  |  |
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 | 386 |  |  |  |  |  |  | ₨ 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 | $ 404 |  |  |  | $ 403 |  |  |

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