Segment Information - Reconciliation of Total Reportable Segments Operating Income to Consolidated Income before Provision for Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating Income		$ 28,686	$ 22,877	$ 30,467
Severance charges		(1,733)	(533)	(304)
Other components of net periodic pension and benefit charges		(33)	(248)	(387)
Asset and business rationalization		(374)	(480)	0
Legacy legal matter		(106)	0	0
Verizon Business Group goodwill impairment	$ (5,800)	0	(5,841)	0
Legal settlement		0	(100)	0
Business transformation costs		0	(176)	0
Non-strategic business shutdown		0	(179)	0
Equity in earnings (losses) of unconsolidated businesses		(53)	(53)	44
Other income (expense), net		995	(313)	1,373
Interest expense		(6,649)	(5,524)	(3,613)
Income Before Provision For Income Taxes		22,979	16,987	28,271
Operating Segments
Segment Reporting Information [Line Items]
Operating Income		31,542	31,077	31,477
Corporate and other
Segment Reporting Information [Line Items]
Operating Income		$ (610)	$ (643)	$ (319)