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Fair Value Measurements and Financial Instruments - Schedule of Designated Derivative Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest rate swaps | Fair Value Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional value entered into	$ 0	$ 0	$ 0	$ 0
Notional value settled	0	1,254,000,000	985,000,000	1,254,000,000
Pre-tax gain (loss) recognized in Interest expense	0	(2,000,000)	0	1,000,000
Cash received (paid) for settlement of derivatives			(45,000,000)	(6,000,000)
Cross currency swaps
Derivative [Line Items]
Pre-tax gain (loss) recognized in Interest expense	0	0	0	0
Cross currency swaps | Fair Value Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional value entered into	2,294,000,000	0	2,294,000,000	2,146,000,000
Notional value settled	995,000,000	0	2,170,000,000	3,619,000,000
Exchange gains (losses) from the conversion of foreign currency denominated as debt	(206,000,000)	1,272,000,000	3,293,000,000	438,000,000
Excluded component	(191,000,000)	(573,000,000)	(1,068,000,000)	(407,000,000)
Cash received (paid) for settlement of derivatives			(91,000,000)	(243,000,000)
Cross currency swaps | Fair Value Hedges | Designated as Hedging Instrument | Verizon Stated And Floating Rate Notes and Bonds
Derivative [Line Items]
Exchange gains (losses) from the conversion of foreign currency denominated as debt	206,000,000	(1,272,000,000)	(3,293,000,000)	(438,000,000)
Cross currency swaps | Fair Value Hedges | Designated as Hedging Instrument | Interest Expense
Derivative [Line Items]
Excluded component	23,000,000	23,000,000	70,000,000	73,000,000
Treasury rate locks | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Notional value entered into	1,100,000,000	1,000,000,000	6,000,000,000	1,000,000,000
Notional value settled	0	1,000,000,000	0	1,000,000,000
Cash received (paid) for settlement of derivatives			0	(21,000,000)
Pre-tax gain (loss) recognized in Other income, net	$ (42,000,000)	$ (21,000,000)	$ (97,000,000)	$ (21,000,000)

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