Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Device payment plan agreement receivables, at amortized cost
Device payment plan agreement receivables, at amortized cost	$ 31,445	$ 31,308
Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2025	14,027
2024	11,583
2023 and prior	4,830
Device payment plan agreement receivables, at amortized cost	30,440
Gross write-offs
2025	131
2024	582
2023 and prior	290
Gross write-offs	1,003
Wireless Service Plan Receivables
Device payment plan agreement receivables, at amortized cost
2025	6,041
2024	82
Device payment plan agreement receivables, at amortized cost	6,123
Gross write-offs
2025	201
2024 and prior	189
Gross write-offs	390
New customers \| Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2025	2,603
2024	1,952
2023 and prior	733
Device payment plan agreement receivables, at amortized cost	5,288
Gross write-offs
2025	110
2024	421
2023 and prior	135
Gross write-offs	666
Existing customers \| Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2025	11,424
2024	9,631
2023 and prior	4,097
Device payment plan agreement receivables, at amortized cost	25,152
Gross write-offs
2025	21
2024	161
2023 and prior	155
Gross write-offs	$ 337

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

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