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Additional Financial Information - Cash Flow Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash Paid      
Interest, net of amounts capitalized $ 4,384 $ 3,316 $ 3,435
Income taxes, net of amounts refunded 2,343 2,736 3,040
Other, net Cash Flows from Operating Activities      
Changes in device payment plan agreement non-current receivables (2,975) (4,919) (2,438)
Net debt extinguishment (gains) losses (308) 1,077 3,541
Loss on spectrum licenses 0 0 223
Gain on disposition of Media business 0 0 (1,051)
Other, net (427) 64 (368)
Other, net Cash Flows from Operating Activities (3,710) (3,778) (93)
Other, net Cash Flows from Financing Activities      
Net debt related costs (73) (366) (2,309)
Other, net (1,397) (1,706) (1,523)
Other, net Cash Flows from Financing Activities $ (1,470) $ (2,072) $ (3,832)