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Income Taxes (Narrative) (One-time Transaction) (Details) $ in Millions, ₨ in Billions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2024 USD ($)	Jan. 08, 2024 USD ($)	Apr. 30, 2018 INR (₨)	Mar. 31, 2018 INR (₨)
One-time Transaction [Table] [Line Items]
Deferred tax asset, research and experimental	$ 390		$ 390
Anticipated non-cash tax expense from OBBBA	390
Income tax expense	613	$ 170	1,023	$ 514
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	372		372							₨ 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	$ 389		$ 389				$ 403

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