Fair Value Measurements and Financial Instruments - Derivative Activity (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Interest rate swaps | Fair Value Hedges
Derivatives, Fair Value [Line Items]
Notional value entered into	$ 0	$ 0
Notional value settled	2,046	0
Cash received (paid) for settlement of derivatives	(57)	0
Interest rate swaps | Fair Value Hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Pre-tax gain recognized in Interest expense	4	1
Cross currency swaps | Fair Value Hedges
Derivatives, Fair Value [Line Items]
Notional value entered into	2,146	0
Notional value settled	3,619	1,450
Exchange gains and losses from the conversion of foreign currency denominated as debt	(1,839)	1,119
Excluded components	730	826
Cash received (paid) for settlement of derivatives	(243)	(67)
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	1,839	(1,119)
Cross currency swaps | Fair Value Hedges | Interest Expense
Derivatives, Fair Value [Line Items]
Excluded components	96	109
Treasury rate locks | Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Notional value entered into	1,000	500
Notional value settled	1,000	500
Pre-tax gain (loss) recognized in Other comprehensive income (loss)	(21)	5
Cash received (paid) for settlement of derivatives	$ (21)	$ 5