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Fair Value Measurements and Financial Instruments - Derivative Activity (Details) - Designated as Hedging Instrument - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Interest rate swaps | Fair Value Hedges    
Derivatives, Fair Value [Line Items]    
Notional value entered into $ 0 $ 7,155
Notional value settled 0 863
Cash received (paid) for settlement of derivatives 0 40
Interest rate swaps | Fair Value Hedges | Interest Expense    
Derivatives, Fair Value [Line Items]    
Pre-tax gain recognized in Interest expense 1 2
Cross currency swaps | Fair Value Hedges    
Derivatives, Fair Value [Line Items]    
Notional value entered into 0 2,474
Notional value settled 1,450 0
Exchange gains and losses from the conversion of foreign currency denominated as debt 1,119 (1,373)
Excluded components 826 (498)
Cash received (paid) for settlement of derivatives (67) 0
Cross currency swaps | Fair Value Hedges | 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 (1,119) 1,373
Cross currency swaps | Fair Value Hedges | Interest Expense    
Derivatives, Fair Value [Line Items]    
Excluded components 109 81
Cross currency swaps | Cash Flow Hedges    
Derivatives, Fair Value [Line Items]    
Pre-tax gain recognized in Other comprehensive income (loss)   (430)
Forward starting interest rate swaps | Cash Flow Hedges    
Derivatives, Fair Value [Line Items]    
Notional value entered into 0 0
Notional value settled 0 1,000
Pre-tax gain recognized in Other comprehensive income (loss) 0 196
Cash received (paid) for settlement of derivatives 0 (107)
Treasury rate locks | Cash Flow Hedges    
Derivatives, Fair Value [Line Items]    
Notional value entered into 500 0
Notional value settled 500 0
Pre-tax gain recognized in Other comprehensive income (loss) 5 0
Cash received (paid) for settlement of derivatives $ 5 $ 0