Additional Financial Information - Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Paid
Interest, net of amounts capitalized	$ 3,435	$ 4,420	$ 4,714
Income taxes, net of amounts refunded	3,040	2,725	3,583
Other, net Cash Flows from Operating Activities
Changes in device payment plan agreement non-current receivables	(2,438)	558	23
Early debt extinguishment costs	3,541	129	3,604
Loss on spectrum licenses	223	1,195	0
Net loss (gain) on sale of divested businesses	(1,051)	0	0
Other, net	(368)	898	(134)
Other, net Cash Flows from Operating Activities	(93)	2,780	3,493
Other, net Cash Flows from Financing Activities
Net debt related costs	(2,309)	(1,055)	(1,797)
Other, net	(1,523)	(1,657)	(1,120)
Other, net Cash Flows from Financing Activities	$ (3,832)	$ (2,712)	$ (2,917)