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Debt - Additional Information (Detail)				1 Months Ended			3 Months Ended
Debt - Additional Information (Detail)	Apr. 24, 2017 USD ($)	Feb. 10, 2017 USD ($)	Feb. 03, 2017 USD ($) Offering	Mar. 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Jan. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Net pre-tax losses on early debt redemption							$ 800,000,000
Principal amount outstanding in connection with the guarantee of debt obligations				$ 116,546,000,000			116,546,000,000	$ 108,078,000,000
Credit Facility
Debt Instrument [Line Items]
Borrowing capacity				9,000,000,000			9,000,000,000
Amount of unused borrowing capacity under credit facility				8,900,000,000			8,900,000,000
Guarantee of Debentures of Operating Telephone Company Subsidiaries
Debt Instrument [Line Items]
Principal amount outstanding in connection with the guarantee of debt obligations				1,000,000,000			1,000,000,000
Guarantee of Debt Obligations of GTE Corporation
Debt Instrument [Line Items]
Principal amount outstanding in connection with the guarantee of debt obligations				800,000,000			800,000,000
January 2017 Cash Offers
Debt Instrument [Line Items]
Aggregate principal amount		$ 100,000,000
Amount of notes repaid		$ 100,000,000
January 2017 Term Loan Credit Agreement
Debt Instrument [Line Items]
Borrowing capacity						$ 5,500,000,000
Debt instrument maturity period						18 months
Term loan agreement partial mandatory prepayment period						6 months
Asset-Backed Debt
Debt Instrument [Line Items]
Asset-backed debt, carrying value				6,300,000,000			6,300,000,000
ABS Financing Facility
Debt Instrument [Line Items]
Asset-backed debt, carrying value				2,500,000,000			$ 2,500,000,000
Collateral revolving period							2 years
Additional borrowing capacity				500,000,000			$ 500,000,000
July 2014 Term Loan Agreement
Debt Instrument [Line Items]
Term loan agreement prepaid amount				1,700,000,000
Outstanding amount under the term loan agreement				$ 3,300,000,000			3,300,000,000
Debt instrument maturity date				2019-07
4.95% Notes due 2047 \| February Debt Issuance
Debt Instrument [Line Items]
Aggregate principal amount					$ 1,500,000,000
Stated interest rate on debt instrument					4.95%
Debt instrument maturity date					2047
Proceeds from long-term borrowings					$ 1,500,000,000
Senior and junior asset-backed notes \| Asset Backed Notes
Debt Instrument [Line Items]
Aggregate principal amount				$ 1,300,000,000			$ 1,300,000,000
Class A Senior Secured Notes \| Asset Backed Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument				2.06%			2.06%
Debt instrument maturity period				2 years 7 months 6 days
Class B Junior Secured Notes \| Asset Backed Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument				2.45%			2.45%
Debt instrument maturity period				3 years 4 months 17 days
Class C Junior Secured Notes \| Asset Backed Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument				2.65%			2.65%
Debt instrument maturity period				3 years 7 months 21 days
Verizon Communications Inc \| January 2017 Exchange Offers
Debt Instrument [Line Items]
Exchange offer expiration date			Jan. 31, 2017
Number of separate private offers to exchange \| Offering			18
Exchange Offer Settlement Date			Feb. 03, 2017
Amount of notes repaid			$ 600,000,000
Verizon Communications Inc \| 2.946% Notes due 2022
Debt Instrument [Line Items]
Aggregate principal amount			$ 3,200,000,000
Stated interest rate on debt instrument			2.946%
Debt instrument maturity date			2022
Verizon Communications Inc \| 4.812% Notes due 2039
Debt Instrument [Line Items]
Aggregate principal amount			$ 1,700,000,000
Stated interest rate on debt instrument			4.812%
Debt instrument maturity date			2039
Verizon Communications Inc \| 5.012% Notes due 2049
Debt Instrument [Line Items]
Aggregate principal amount			$ 4,100,000,000
Stated interest rate on debt instrument			5.012%
Debt instrument maturity date			2049
Verizon Communications Inc \| January 2017 Cash Offers
Debt Instrument [Line Items]
Aggregate principal amount			$ 500,000,000
Amount of notes repaid			$ 500,000,000
Cash offer expiration date			Jan. 31, 2017
Cash offer settlement date			Feb. 03, 2017
Verizon Communications Inc \| March Debt Issuance
Debt Instrument [Line Items]
Aggregate principal amount				$ 11,000,000,000			$ 11,000,000,000
Proceeds from long-term borrowings				10,900,000,000
Verizon Communications Inc \| Old Notes in Exchange New Notes \| January 2017 Exchange Offers
Debt Instrument [Line Items]
Aggregate principal amount			$ 8,300,000,000
Verizon Communications Inc \| Floating Rate Notes \| March Debt Issuance
Debt Instrument [Line Items]
Aggregate principal amount				$ 1,400,000,000			1,400,000,000
Debt instrument maturity date				2022
Verizon Communications Inc \| 3.125% Notes Due 2022 \| March Debt Issuance
Debt Instrument [Line Items]
Aggregate principal amount				$ 1,850,000,000			$ 1,850,000,000
Stated interest rate on debt instrument				3.125%			3.125%
Debt instrument maturity date				2022
Verizon Communications Inc \| 4.125% Notes Due 2027 \| March Debt Issuance
Debt Instrument [Line Items]
Aggregate principal amount				$ 3,250,000,000			$ 3,250,000,000
Stated interest rate on debt instrument				4.125%			4.125%
Debt instrument maturity date				2027
Verizon Communications Inc \| 5.250% Notes Due 2037 \| March Debt Issuance
Debt Instrument [Line Items]
Aggregate principal amount				$ 3,000,000,000			$ 3,000,000,000
Stated interest rate on debt instrument				5.25%			5.25%
Debt instrument maturity date				2037
Verizon Communications Inc \| 5.500% Notes Due 2047 \| March Debt Issuance
Debt Instrument [Line Items]
Aggregate principal amount				$ 1,500,000,000			$ 1,500,000,000
Stated interest rate on debt instrument				5.50%			5.50%
Debt instrument maturity date				2047
Verizon Communications Inc \| London Interbank Offered Rate (LIBOR) \| March Debt Issuance
Debt Instrument [Line Items]
Debt instrument, percentage points added to the reference rate				1.00%
Verizon Communications Inc \| Subsequent Event \| April Debt Redemption \| 6.10% Notes due 2018
Debt Instrument [Line Items]
Stated interest rate on debt instrument	6.10%
Debt instrument maturity date	2018
Amount of notes repaid	$ 500,000,000
Notes purchased price of principal amount of note, percentage	104.50%
Verizon Communications Inc \| Subsequent Event \| April Debt Redemption \| 5.50% Notes due 2018
Debt Instrument [Line Items]
Stated interest rate on debt instrument	5.50%
Debt instrument maturity date	2018
Amount of notes repaid	$ 500,000,000
Notes purchased price of principal amount of note, percentage	103.30%
GTE LLC \| February Redemption \| 6.94% Debentures due 2028
Debt Instrument [Line Items]
Aggregate principal amount					$ 600,000,000
Stated interest rate on debt instrument					6.94%
Debt instrument maturity date					2028
Amount of notes repaid					$ 200,000,000
Notes purchased price of principal amount of note, percentage					124.80%
Network Equipment \| Maximum \| Credit Facility
Debt Instrument [Line Items]
Borrowing capacity				$ 1,000,000,000			$ 1,000,000,000
Network Equipment \| Vendor Financing Facility
Debt Instrument [Line Items]
Value of purchase assets financed							100,000,000
Long-term debt maturing within one year				$ 1,200,000,000			$ 1,200,000,000