Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable, net	$ 12,587	$ 12,929
Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	23,748	25,332
Less Allowance for credit losses	892	826
Accounts receivable, net of allowance	22,856	$ 24,506
Device payment plan agreement
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	13,065
Less Allowance for credit losses	478
Accounts receivable, net	12,587
Wireless service
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	4,989
Less Allowance for credit losses	179
Accounts receivable, net	4,810
Other receivables
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	5,694
Less Allowance for credit losses	235
Accounts receivable, net	$ 5,459