Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Device payment plan agreement receivables, at amortized cost
Device payment plan agreement receivables, at amortized cost	$ 34,004	$ 31,308
Wireless service
Gross write-offs
Gross write-offs	540
Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2025	20,288
2024	9,684
2023 and prior	2,979
Device payment plan agreement receivables, at amortized cost	32,951
Gross write-offs
2025	288
2024	719
2023 and prior	349
Gross write-offs	1,356
Wireless service
Device payment plan agreement receivables, at amortized cost
2025	6,002
2024	60
Device payment plan agreement receivables, at amortized cost	6,062
Gross write-offs
2025	351
2024 and prior	189
Gross write-offs	540
New customers \| Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2025	3,981
2024	1,587
2023 and prior	452
Device payment plan agreement receivables, at amortized cost	6,020
Gross write-offs
2025	228
2024	496
2023 and prior	160
Gross write-offs	884
Existing customers \| Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2025	16,307
2024	8,097
2023 and prior	2,527
Device payment plan agreement receivables, at amortized cost	26,931
Gross write-offs
2025	60
2024	223
2023 and prior	189
Gross write-offs	$ 472

Amount of writeoff of financing receivable, charged against allowance for credit loss.

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