Taxes - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Effective income tax rate		21.90%	28.80%	23.10%
Verizon Business Group goodwill impairment	$ 5,800	$ 0	$ 5,841	$ 0
Net tax loss and credit carry forwards (tax effected)	1,922	1,719	1,922
Net tax loss and credit carry forwards (tax effected), portion that will expire		1,100
Operating loss carry forwards amount		591
Valuation allowance, deferred tax asset, increase, amount		59
Valuation allowance	1,341	1,399	1,341
Unrecognized tax benefits, that if recognized, would favorably affect the effective income tax rate	$ 2,300	$ 2,300	$ 2,300	$ 2,500