Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Device payment plan agreement receivables, at amortized cost
Device payment plan agreement receivables, at amortized cost	$ 32,706	$ 34,004
Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2026	8,914
2025	15,719
2024 and prior	7,057
Device payment plan agreement receivables, at amortized cost	31,690
Gross write-offs
2026	39
2025	407
2024 and prior	242
Gross write-offs	688
Wireless Service Plan Receivables
Device payment plan agreement receivables, at amortized cost
2026	6,194
2025	102
Device payment plan agreement receivables, at amortized cost	6,296
Gross write-offs
2026	95
2025 and prior	183
Gross write-offs	278
New customers \| Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2026	2,046
2025	2,907
2024 and prior	1,109
Device payment plan agreement receivables, at amortized cost	6,062
Gross write-offs
2026	37
2025	286
2024 and prior	107
Gross write-offs	430
Existing customers \| Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2026	6,868
2025	12,812
2024 and prior	5,948
Device payment plan agreement receivables, at amortized cost	25,628
Gross write-offs
2026	2
2025	121
2024 and prior	135
Gross write-offs	$ 258

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

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