v3.26.3
Fair Value Measurements and Financial Instruments - Schedule of Designated Derivative Activity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Interest rate swaps | Fair Value Hedges | Designated as Hedging Instrument        
Derivative [Line Items]        
Notional value entered into $ 0 $ 0 $ 0 $ 0
Notional value settled 1,250,000,000 0 1,250,000,000 985,000,000
Pre-tax gain (loss) recognized in Interest expense 6,000,000 0 14,000,000 0
Cash received (paid) for settlement of derivatives     (54,000,000) (45,000,000)
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 0 2,294,000,000 3,836,000,000 2,294,000,000
Notional value settled 0 995,000,000 309,000,000 2,170,000,000
Pre-tax gain (loss) recognized in Interest expense (238,000,000) (206,000,000) (1,175,000,000) 3,293,000,000
Excluded components recognized in Other comprehensive income (loss) 209,000,000 (191,000,000) 725,000,000 (1,068,000,000)
Initial value of the excluded component amortized into Interest expense 22,000,000 23,000,000 65,000,000 70,000,000
Cash received (paid) for settlement of derivatives     17,000,000 (91,000,000)
Cross currency swaps | Fair Value Hedges | Designated as Hedging Instrument | Verizon Stated And Floating Rate Notes and Bonds        
Derivative [Line Items]        
Pre-tax gain (loss) recognized in Interest expense 238,000,000 206,000,000 1,175,000,000 (3,293,000,000)
Treasury rate locks | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative [Line Items]        
Notional value entered into 0 1,100,000,000 0 6,000,000,000
Notional value settled 0 0 0 0
Pre-tax gain (loss) recognized in Other income, net $ 0 $ (42,000,000) $ 0 $ (97,000,000)