Segment Information - Reconciliation of Total Reportable Segments Operating Income to Consolidated Income before Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating Income	$ 30,467	$ 32,448	$ 28,798
Severance charges	(304)	(209)	(221)
Other components of net periodic pension and benefit charges	(387)	(769)	(817)
Loss on spectrum licenses	0	(223)	(1,195)
Net gain (loss) from disposition of business	0	706	(126)
Equity in earnings (losses) of unconsolidated businesses	44	145	(45)
Other income (expense), net	1,373	312	(539)
Interest expense	(3,613)	(3,485)	(4,247)
Income Before Provision For Income Taxes	28,271	29,420	23,967
Operating Segments
Segment Reporting Information [Line Items]
Operating Income	31,477	33,392	32,629
Corporate and other
Segment Reporting Information [Line Items]
Operating Income	$ (319)	$ (449)	$ (1,472)