v3.26.1
Fair Value Measurements and Financial Instruments - Schedule of Designated Derivative Activity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Interest rate swaps | Fair Value Hedges | Designated as Hedging Instrument    
Derivative [Line Items]    
Notional value entered into $ 0 $ 0
Notional value settled 0 0
Pre-tax gain recognized in Interest expense 3,000,000 0
Cross currency swaps    
Derivative [Line Items]    
Pre-tax gain recognized in Interest expense 0 0
Cross currency swaps | Fair Value Hedges | Designated as Hedging Instrument    
Derivative [Line Items]    
Notional value entered into 3,836,000,000 0
Notional value settled 0 359,000,000
Exchange gains (losses) from the conversion of foreign currency denominated as debt (601,000,000) 1,078,000,000
Excluded component (229,000,000) (848,000,000)
Cash received (paid) for settlement of derivatives 0 (73,000,000)
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 601,000,000 (1,078,000,000)
Cross currency swaps | Fair Value Hedges | Designated as Hedging Instrument | Interest Expense    
Derivative [Line Items]    
Excluded component $ 22,000,000 $ 23,000,000