Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable, net of allowance	$ 12,929	$ 12,783
Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	25,332	24,742
Less Allowance for credit losses	826	896
Accounts receivable, net	24,506	$ 23,846
Device payment plan agreement
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	13,374
Less Allowance for credit losses	445
Accounts receivable, net of allowance	12,929
Wireless service
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	5,140
Less Allowance for credit losses	143
Accounts receivable, net	4,997
Other receivables
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	6,818
Less Allowance for credit losses	238
Accounts receivable, net	$ 6,580