Fair Value Measurements and Financial Instruments - Derivative Activity (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Interest rate swaps \| Fair Value Hedges \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional value entered into	$ 634	$ 0
Notional value settled	985	2,046
Cash received (paid) for settlement of derivatives	(45)	(57)
Interest rate swaps \| Fair Value Hedges \| Designated as Hedging Instrument \| Interest Expense
Derivatives, Fair Value [Line Items]
Pre-tax gain (loss) recognized in Interest expense	(10)	4
Cross currency swaps \| Fair Value Hedges \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional value entered into	6,191	2,146
Notional value settled	2,170	3,619
Exchange gains and losses from the conversion of foreign currency denominated as debt	3,476	(1,839)
Excluded components	(1,131)	730
Cash received (paid) for settlement of derivatives	(91)	(243)
Cross currency swaps \| Fair Value Hedges \| Designated as Hedging Instrument \| Verizon Stated And Floating Rate Notes And Bonds
Derivatives, Fair Value [Line Items]
Exchange gains and losses from the conversion of foreign currency denominated as debt	(3,476)	1,839
Cross currency swaps \| Fair Value Hedges \| Designated as Hedging Instrument \| Interest Expense
Derivatives, Fair Value [Line Items]
Excluded components	92	96
Treasury rate locks \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional value entered into	1,250	0
Notional value settled	1,250	0
Pre-tax gain (loss) recognized in Other comprehensive income (loss)	(5)	0
Treasury rate locks \| Cash Flow Hedges \| Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional value entered into	6,000	1,000
Notional value settled	6,000	1,000
Pre-tax gain (loss) recognized in Other comprehensive income (loss)	(121)	(21)
Cash received (paid) for settlement of derivatives	0	(21)
Proceeds (payments) for settlement of derivative, deferred	121
Foreign exchange forwards \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional value entered into	7,740	8,640
Notional value settled	7,790	9,070
Pre-tax gain (loss) recognized in Other comprehensive income (loss)	$ 75	$ (50)

Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method.

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