Wireless Licenses, Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Indefinite-lived Intangible Assets [Line Items]
Payments for intangible assets		$ 900	$ 5,796	$ 3,653
Capitalized interest costs		963	1,818	2,030
Verizon Business Group goodwill impairment	$ 5,800	0	5,841	0
Goodwill impairment, after-tax	5,800
Wireless Licenses
Indefinite-lived Intangible Assets [Line Items]
Wireless licenses under development	$ 15,000	10,100	15,000
Capitalized interest costs		$ 616	$ 1,400
Average remaining renewal period of wireless license portfolio (in years)		10 years	10 years
Spectrum Licenses, C-Band | Loss on spectrum license transactions | Projected Clearing Costs
Indefinite-lived Intangible Assets [Line Items]
Payments for intangible assets		$ 269	$ 4,300	$ 1,600