Additional Financial Information - Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Paid
Interest, net of amounts capitalized	$ 5,505	$ 4,384	$ 3,316
Income taxes, net of amounts refunded	5,632	2,343	2,736
Other, net Cash Flows from Operating Activities
Changes in device payment plan agreement non-current receivables	(538)	(2,975)	(4,919)
Net debt extinguishment (gains) losses	(385)	(308)	1,077
Other, net	1,096	(427)	64
Other, net Cash Flows from Operating Activities	173	(3,710)	(3,778)
Other, net Cash Flows from Financing Activities
Net debt related costs	(259)	(73)	(366)
Other, net	(816)	(1,397)	(1,706)
Other, net Cash Flows from Financing Activities	$ (1,075)	$ (1,470)	$ (2,072)