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Debt - Issuances, Debt Assumed And Commercial Paper Program (Details) € in Millions, £ in Millions, $ in Millions		3 Months Ended			9 Months Ended
	Jan. 20, 2026 USD ($)	Sep. 30, 2026 USD ($)	Jun. 30, 2026 USD ($)	Mar. 31, 2026 USD ($)	Sep. 30, 2026 USD ($)	Mar. 31, 2026 EUR (€)	Mar. 31, 2026 GBP (£)	Mar. 31, 2026 AUD ($)
Short-term Debt [Line Items]
Net Proceeds		$ 3,718,000,000	$ 3,966,000,000	$ 4,380,000,000	$ 12,064,000,000
Frontier
Short-term Debt [Line Items]
Principal Amount Issued	$ 12,700,000,000
Business combination, consideration transferred, liabilities incurred	$ 12,900,000,000
Repayments of assumed debt					12,400,000,000
Debt outstanding		$ 219,000,000			$ 219,000,000
Verizon 4.246% junior subordinated notes due 2056
Short-term Debt [Line Items]
Debt instrument, interest rate, stated percentage						4.246%	4.246%	4.246%
Principal Amount Issued \| €						€ 2,250
Net Proceeds				2,646,000,000
Verizon 5.743% junior subordinated notes due 2056
Short-term Debt [Line Items]
Debt instrument, interest rate, stated percentage						5.743%	5.743%	5.743%
Principal Amount Issued \| £							£ 600
Net Proceeds				809,000,000
Verizon Floating Rate Junior Subordinated Notes Due 2056
Short-term Debt [Line Items]
Principal Amount Issued								$ 800
Net Proceeds				569,000,000
Verizon 6.745% Junior Subordinated Notes Due 2056
Short-term Debt [Line Items]
Debt instrument, interest rate, stated percentage						6.745%	6.745%	6.745%
Principal Amount Issued								$ 250
Net Proceeds				178,000,000
Verizon 7.166% Junior Subordinated Notes Due 2056
Short-term Debt [Line Items]
Debt instrument, interest rate, stated percentage						7.166%	7.166%	7.166%
Principal Amount Issued								$ 250
Net Proceeds				$ 178,000,000
Verizon 6.050% Junior Subordinated Notes Due 2058
Short-term Debt [Line Items]
Debt instrument, interest rate, stated percentage			6.05%
Principal Amount Issued			$ 2,000,000,000
Net Proceeds			$ 1,983,000,000
Verizon 6.200% Junior Subordinated Notes Due 2056
Short-term Debt [Line Items]
Debt instrument, interest rate, stated percentage			6.20%
Principal Amount Issued			$ 2,000,000,000
Net Proceeds			$ 1,983,000,000
Verizon 6.600% Junior Subordinated Notes Due 2059
Short-term Debt [Line Items]
Debt instrument, interest rate, stated percentage		6.60%			6.60%
Principal Amount Issued		$ 2,000,000,000			$ 2,000,000,000
Net Proceeds		$ 1,983,000,000
Verizon 6.750% Junior Subordinated Notes Due 2057
Short-term Debt [Line Items]
Debt instrument, interest rate, stated percentage		6.75%			6.75%
Principal Amount Issued		$ 1,750,000,000			$ 1,750,000,000
Net Proceeds		1,735,000,000
Commercial Paper
Short-term Debt [Line Items]
Commercial paper issued					13,200,000,000
Repayments of short-term debt					13,200,000,000
Commercial paper		$ 0			$ 0