Debt - Schedule of Long-term Debt Obligations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Schedule of Capitalization, Long-term Debt [Line Items]
Finance lease obligations	$ 2,349	$ 2,091
Unamortized discount, net of premium	(3,604)	(3,812)
Unamortized debt issuance costs	(558)	(616)
Total long-term debt, including current maturities	143,949	150,674
Less long-term debt maturing within one year	22,568	12,973
Total long-term debt	121,381	137,701
Add short-term vendor financing arrangements	65	0
Debt maturing within one year	22,633	12,973
Total debt	$ 144,014	$ 150,674
Finance Lease, Liability
Schedule of Capitalization, Long-term Debt [Line Items]
Finance lease obligations average rate	4.80%	2.90%
Vendor Financing Arrangements
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 85	$ 64
Floating Rate, Maturities Less Than 5 Years And 5 To 10 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, percentage points added to the reference rate	4.598%
Floating Rate, Maturities Less Than 5 Years And 5 To 10 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, percentage points added to the reference rate	5.556%
Verizon Communications | Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 29,325	33,316
Verizon Communications | Maturities Less Than 5 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	0.75%
Verizon Communications | Maturities Less Than 5 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	6.94%
Verizon Communications | Maturities 5 To 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 33,851	37,229
Verizon Communications | Maturities 5 To 10 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	1.50%
Verizon Communications | Maturities 5 To 10 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	7.88%
Verizon Communications | Maturities Greater Than 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 52,719	55,355
Verizon Communications | Maturities Greater Than 10 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	1.13%
Verizon Communications | Maturities Greater Than 10 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	8.95%
Verizon Communications | Floating Rate, Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 1,171	2,099
Verizon Communications | Floating Rate, Maturities 5 To 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 1,735	2,029
Alltel Corporation | Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	6.80%
Long-term debt, gross	$ 38
Alltel Corporation | Maturities 5 To 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 56	94
Alltel Corporation | Maturities 5 To 10 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	6.80%
Alltel Corporation | Maturities 5 To 10 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	7.88%
Operating telephone company subsidiaries—debentures | Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 286	79
Operating telephone company subsidiaries—debentures | Maturities Less Than 5 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	6.00%
Operating telephone company subsidiaries—debentures | Maturities Less Than 5 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	8.38%
Operating telephone company subsidiaries—debentures | Maturities 5 To 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 328	535
Operating telephone company subsidiaries—debentures | Maturities 5 To 10 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	5.13%
Operating telephone company subsidiaries—debentures | Maturities 5 To 10 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	8.75%
Other subsidiaries – asset-backed debt | Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 16,363	14,048
Other subsidiaries – asset-backed debt | Maturities Less Than 5 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	0.50%
Other subsidiaries – asset-backed debt | Maturities Less Than 5 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Debt instrument, interest rate, stated percentage	6.09%
Other subsidiaries – asset-backed debt | Floating Rate, Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross	$ 9,805	$ 8,163