Debt - Schedule of Long-term Debt Obligations (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Schedule of Capitalization, Long-term Debt [Line Items]
Finance lease obligations (average rate of 2.2% and 2.5% in 2021 and 2020, respectively)		$ 1,325	$ 1,284
Unamortized discount, net of premium		(4,922)	(6,057)
Unamortized debt issuance costs		(688)	(604)
Total long-term debt, including current maturities		150,868	128,742
Less long-term debt maturing within one year		7,443	5,569
Total long-term debt		143,425	123,173
Short-term notes payable		0	320
Total debt		150,868	$ 129,062
Repayments of debt		$ 9,078
Capital Lease Obligations
Schedule of Capitalization, Long-term Debt [Line Items]
Finance lease obligations average rate		2.20%	2.50%
GTE LLC 8.750% debentures due 2021
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		8.75%
Repayments of debt		$ 141
Floating Rate, Maturities Less Than 5 Years And 5 To 10 Years | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Schedule of Capitalization, Long-term Debt [Line Items]
Effective interest rate		0.049%
Floating Rate, Maturities Less Than 5 Years And 5 To 10 Years | One Month LIBOR
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		0.101%
Floating Rate, Maturities Less Than 5 Years And 5 To 10 Years | Three Month LIBOR
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		0.209%
Verizon Communications
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 250
Verizon Communications | Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 18,406	$ 17,936
Verizon Communications | Maturities Less Than 5 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		0.75%
Verizon Communications | Maturities Less Than 5 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		5.82%
Verizon Communications | Maturities 5 To 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 43,225	35,423
Verizon Communications | Maturities 5 To 10 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		1.38%
Verizon Communications | Maturities 5 To 10 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		7.75%
Verizon Communications | Maturities Greater Than 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 73,520	65,019
Verizon Communications | Maturities Greater Than 10 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		1.13%
Verizon Communications | Maturities Greater Than 10 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		8.95%
Verizon Communications | Floating Rate, Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 4,086	2,917
Verizon Communications | Floating Rate, Maturities 5 To 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 824	941
Alltel Corporation | Maturities 5 To 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		6.80%
Long-term debt, gross		$ 38	38
Alltel Corporation | Maturities Greater Than 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		7.88%
Long-term debt, gross		$ 58	58
Operating telephone company subsidiaries—debentures | Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 141	141
Operating telephone company subsidiaries—debentures | Maturities Less Than 5 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		7.88%
Operating telephone company subsidiaries—debentures | Maturities Less Than 5 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		8.00%
Operating telephone company subsidiaries—debentures | Maturities 5 To 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 375	317
Operating telephone company subsidiaries—debentures | Maturities 5 To 10 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		6.00%
Operating telephone company subsidiaries—debentures | Maturities 5 To 10 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		8.75%
Operating telephone company subsidiaries—debentures | Maturities Greater Than 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 250	308
Operating telephone company subsidiaries—debentures | Maturities Greater Than 10 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		5.13%
Operating telephone company subsidiaries—debentures | Maturities Greater Than 10 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		8.75%
GTE LLC | Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross			141
GTE LLC | Maturities 5 To 10 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross			250
GTE LLC | GTE LLC 8.750% debentures due 2021
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument	8.75%
Repayments of debt	$ 141
Other subsidiaries | Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 9,620	9,414
Other subsidiaries | Maturities Less Than 5 Years | Minimum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		0.41%
Other subsidiaries | Maturities Less Than 5 Years | Maximum
Schedule of Capitalization, Long-term Debt [Line Items]
Stated interest rate on debt instrument		3.56%
Other subsidiaries | Floating Rate, Maturities Less Than 5 Years
Schedule of Capitalization, Long-term Debt [Line Items]
Long-term debt, gross		$ 4,610	$ 1,216