Debt - Credit Facilities, Non-Cash Transaction, Guarantees (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Facility Capacity	$ 22,000,000,000		$ 22,000,000,000
Unused Capacity	11,963,000,000		11,963,000,000
Principal Amount Outstanding	4,912,000,000		4,912,000,000
Debt extinguishment gains (losses)	88,000,000	$ 89,000,000	178,000,000	$ 199,000,000
Pension
Debt Instrument [Line Items]
Employer discretionary contribution amount	563,000,000		563,000,000	365,000,000
Guarantee of Debentures of Operating Telephone Company Subsidiaries
Debt Instrument [Line Items]
Principal amount outstanding in connection with the guarantee of debt obligations	614,000,000		614,000,000
Verizon 5.250% Notes Due 2035
Debt Instrument [Line Items]
Debt instrument, face amount	$ 2,250,000,000		$ 2,250,000,000
Debt instrument, interest rate, stated percentage	5.25%		5.25%
Network Equipment | Alternative Financing Facility
Debt Instrument [Line Items]
Value of purchase assets financed			$ 1,200,000,000	941,000,000
Long-term debt maturing within one year	$ 2,900,000,000		2,900,000,000		$ 2,500,000,000
Verizon revolving credit facility
Debt Instrument [Line Items]
Facility Capacity	12,000,000,000		12,000,000,000
Unused Capacity	11,963,000,000		11,963,000,000
Principal Amount Outstanding	0		0
Amount drawn from credit facilities			0
Various export credit facilities
Debt Instrument [Line Items]
Facility Capacity	10,000,000,000		10,000,000,000
Unused Capacity	0		0
Principal Amount Outstanding	$ 4,912,000,000		4,912,000,000
Amount drawn from credit facilities			$ 0	$ 0