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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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