Fair Value Measurements and Financial Instruments - Schedule of Designated Derivative Activity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative [Line Items]
Exchange gains and losses from the conversion of foreign currency denominated as debt	$ 0	$ 0	$ 0	$ 0
Interest rate swaps | Fair Value Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional value entered into	0	500,000,000	0	7,155,000,000
Notional value settled	0	0	0	863,000,000
Cash received (paid) for settlement of derivatives			0	40,000,000
Interest rate swaps | Fair Value Hedges | Designated as Hedging Instrument | Interest Expense
Derivative [Line Items]
Pre-tax gain recognized in Interest expense	2,000,000	0	1,000,000	0
Cross currency swaps | Fair Value Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional value entered into	0	0	0
Notional value settled	612,000,000	0	1,450,000,000
Exchange gains and losses from the conversion of foreign currency denominated as debt	370,000,000	(1,808,000,000)	725,000,000	(1,808,000,000)
Excluded component	420,000,000	(340,000,000)	42,000,000	(340,000,000)
Cash received (paid) for settlement of derivatives			(67,000,000)
Cross currency swaps | Fair Value Hedges | Designated as Hedging Instrument | Verizon Stated And Floating Rate Notes and Bonds
Derivative [Line Items]
Exchange gains and losses from the conversion of foreign currency denominated as debt	(370,000,000)	1,808,000,000	(725,000,000)	1,808,000,000
Cross currency swaps | Fair Value Hedges | Designated as Hedging Instrument | Interest Expense
Derivative [Line Items]
Excluded component	27,000,000	27,000,000	54,000,000	27,000,000
Cross currency swaps | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Notional value entered into				0
Notional value settled				0
Pre-tax gain (loss) recognized in other comprehensive loss				(430,000,000)
Cash received (paid) for settlement of derivatives				0
Forward starting interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Notional value entered into	0	0	0	0
Notional value settled	0	600,000,000	0	1,000,000,000
Pre-tax gain (loss) recognized in other comprehensive loss	0	68,000,000	0	196,000,000
Cash received (paid) for settlement of derivatives			0	(107,000,000)
Treasury rate locks | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Notional value entered into	500,000,000	0	500,000,000	0
Notional value settled	500,000,000	0	500,000,000	0
Pre-tax gain (loss) recognized in other comprehensive loss	$ 5,000,000	$ 0	5,000,000	0
Cash received (paid) for settlement of derivatives			$ 5,000,000	$ 0