Debt - Additional Information (Detail) | Feb. 10, 2017USD ($) | Feb. 03, 2017USD ($)Offering | Jun. 30, 2017USD ($) | May 31, 2017USD ($) | Apr. 30, 2017USD ($) | Mar. 31, 2017USD ($) | Feb. 28, 2017USD ($) | Jun. 30, 2017USD ($) | May 31, 2017CHF (SFr) | Dec. 31, 2016USD ($) |
Debt Instrument [Line Items] | | | | | | | | | | |
Notes payable | | | $ 500,000,000 | | | | | $ 500,000,000 | | |
Net pre-tax losses on early debt redemption | | | | | | | | 800,000,000 | | |
Principal amount outstanding in connection with the guarantee of debt obligations | | | 117,543,000,000 | | | | | 117,543,000,000 | | $ 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 | | |
January 2017 Cash Offers | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Aggregate principal amount | $ 100,000,000 | | | | | | | | | |
Amount of notes repaid | $ 100,000,000 | | | | | | | | | |
Asset-Backed Debt | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Asset-backed debt | | | 7,900,000,000 | | | | | 7,900,000,000 | | |
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 | | |
Term Loan Agreement | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Term loan agreement prepaid amount | | | | | | $ 1,700,000,000 | | | | |
Amount drawn down | | | | | | $ 3,300,000,000 | | | | |
Debt instrument maturity date | | | | | | 2019-07 | | | | |
ABS Financing Facility | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Asset-backed debt | | | 2,800,000,000 | $ 300,000,000 | | | | $ 2,800,000,000 | | |
Collateral revolving period | | | | | | | | 2 years | | |
Minimum | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Minimum threshhold term | | | | | | | | 9 months | | |
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 | | | | | | | 2,047 | | | |
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 | | $ 1,300,000,000 | | |
Class A Senior Secured Notes | Asset Backed Notes | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Stated interest rate on debt instrument | | | 1.92% | | | 2.06% | | 1.92% | | |
Debt instrument maturity period | | | 2 years 5 months 20 days | | | 2 years 7 months 6 days | | | | |
Class B Junior Secured Notes | Asset Backed Notes | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Stated interest rate on debt instrument | | | 2.22% | | | 2.45% | | 2.22% | | |
Debt instrument maturity period | | | 3 years 1 month 9 days | | | 3 years 4 months 17 days | | | | |
Class C Junior Secured Notes | Asset Backed Notes | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Stated interest rate on debt instrument | | | 2.38% | | | 2.65% | | 2.38% | | |
Debt instrument maturity period | | | 3 years 4 months 2 days | | | 3 years 7 months 21 days | | | | |
Qualified Pension Plans | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Defined benefit plan discretionary contributions by employer | | | | | | | | $ 3,400,000,000 | | |
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. 3, 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 | | 2,022 | | | | | | | | |
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 | | 2,039 | | | | | | | | |
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 | | 2,049 | | | | | | | | |
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. 3, 2017 | | | | | | | | |
Verizon Communications Inc | March Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Aggregate principal amount | | | | | | $ 11,000,000,000 | | | | |
Proceeds from long-term borrowings | | | | | | 10,900,000,000 | | | | |
Verizon Communications Inc | Floating Rate Notes Due 2020 | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Amount of notes repaid | | | $ 1,300,000,000 | | | | | | | |
Verizon Communications Inc | 1.100% Notes Due 2017 | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Stated interest rate on debt instrument | | | 1.10% | | | | | 1.10% | | |
Debt instrument maturity date | | | 2,017 | | | | | | | |
Amount of notes repaid | | | $ 500,000,000 | | | | | | | |
Notes purchased price of principal amount of note, percentage | | | 100.003% | | | | | | | |
Verizon Communications Inc | Maximum | 2.600% to 4.900% Notes | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Stated interest rate on debt instrument | | | 4.90% | | | | | 4.90% | | |
Debt instrument maturity date | | | | | | | | 2,047 | | |
Verizon Communications Inc | Minimum | 2.600% to 4.900% Notes | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Stated interest rate on debt instrument | | | 2.60% | | | | | 2.60% | | |
Debt instrument maturity date | | | | | | | | 2,022 | | |
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 | | | | |
Debt instrument maturity date | | | | | | 2,022 | | | | |
Verizon Communications Inc | 3.125% Notes Due 2022 | March Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Aggregate principal amount | | | | | | $ 1,850,000,000 | | | | |
Stated interest rate on debt instrument | | | | | | 3.125% | | | | |
Debt instrument maturity date | | | | | | 2,022 | | | | |
Verizon Communications Inc | 4.125% Notes Due 2027 | March Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Aggregate principal amount | | | | | | $ 3,250,000,000 | | | | |
Stated interest rate on debt instrument | | | | | | 4.125% | | | | |
Debt instrument maturity date | | | | | | 2,027 | | | | |
Verizon Communications Inc | 5.250% Notes Due 2037 | March Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Aggregate principal amount | | | | | | $ 3,000,000,000 | | | | |
Stated interest rate on debt instrument | | | | | | 5.25% | | | | |
Debt instrument maturity date | | | | | | 2,037 | | | | |
Verizon Communications Inc | 5.500% Notes Due 2047 | March Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Aggregate principal amount | | | | | | $ 1,500,000,000 | | | | |
Stated interest rate on debt instrument | | | | | | 5.50% | | | | |
Debt instrument maturity date | | | | | | 2,047 | | | | |
Verizon Communications Inc | Floating Rate Notes Due 2020 | May Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Aggregate principal amount | | | | $ 1,500,000,000 | | | | | | |
Debt instrument maturity date | | | | 2,020 | | | | | | |
Proceeds from long-term borrowings | | | | $ 1,500,000,000 | | | | | | |
Verizon Communications Inc | 1.00% Bonds due 2027 | May Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Aggregate principal amount | SFr | | | | | | | | | SFr 400,000,000 | |
Stated interest rate on debt instrument | | | | 1.00% | | | | | 1.00% | |
Debt instrument maturity date | | | | 2,027 | | | | | | |
Verizon Communications Inc | 0.375% Bonds due 2023 | May Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Aggregate principal amount | SFr | | | | | | | | | SFr 600,000,000 | |
Stated interest rate on debt instrument | | | | 0.375% | | | | | 0.375% | |
Debt instrument maturity date | | | | 2,023 | | | | | | |
Verizon Communications Inc | April Debt Redemption | 6.10% Notes due 2018 | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Stated interest rate on debt instrument | | | | | 6.10% | | | | | |
Debt instrument maturity date | | | | | 2,018 | | | | | |
Amount of notes repaid | | | | | $ 500,000,000 | | | | | |
Notes purchased price of principal amount of note, percentage | | | | | 104.50% | | | | | |
Verizon Communications Inc | April Debt Redemption | 5.50% Notes due 2018 | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Stated interest rate on debt instrument | | | | | 5.50% | | | | | |
Debt instrument maturity date | | | | | 2,018 | | | | | |
Amount of notes repaid | | | | | $ 500,000,000 | | | | | |
Notes purchased price of principal amount of note, percentage | | | | | 103.30% | | | | | |
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 | London Interbank Offered Rate (LIBOR) | Floating Rate Notes Due 2020 | May Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Debt instrument, percentage points added to the reference rate | | | | 0.55% | | | | | | |
Verizon Communications Inc | Bonds Issued | May Debt Issuance | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Proceeds from long-term borrowings | | | | $ 1,000,000,000 | | | | | | |
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 | | | | | | | 2,028 | | | |
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] | | | | | | | | | | |
Amount drawn down | | | $ 1,000,000,000 | | | | | $ 1,000,000,000 | | |
Network Equipment | Vendor Financing Facility | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | |
Value of purchase assets financed | | | | | | | | 200,000,000 | | |
Long-term debt maturing within one year | | | $ 1,200,000,000 | | | | | $ 1,200,000,000 | | |