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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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