Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable, net	$ 15,547	$ 15,777
Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	27,564	28,347
Less Allowance for credit losses	1,199	1,250
Accounts receivable, net	26,365	$ 27,097
Device payment plan agreement
Financing Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	16,338
Less Allowance for credit losses	791
Accounts receivable, net	15,547
Wireless service
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	6,276
Less Allowance for credit losses	248
Accounts receivable, net	6,028
Other receivables
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable	4,950
Less Allowance for credit losses	160
Accounts receivable, net	$ 4,790

Amount, after allowance for credit loss, of accounts and financing receivables, classified as current. Includes, but is not limited to, notes and loan receivable.

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