Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Device payment plan agreement receivables, at amortized cost
Device payment plan agreement receivables, at amortized cost	$ 33,611	$ 34,004
Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2026	5,024
2025	17,971
2024 and prior	9,578
Device payment plan agreement receivables, at amortized cost	32,573
Gross write-offs
2026	0
2025	192
2024 and prior	133
Gross write-offs	325
Wireless Service Plan Receivables
Device payment plan agreement receivables, at amortized cost
2026	5,716
2025	267
Device payment plan agreement receivables, at amortized cost	5,983
Gross write-offs
2026	17
2025 and prior	112
Gross write-offs	129
New customers \| Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2026	1,241
2025	3,428
2024 and prior	1,521
Device payment plan agreement receivables, at amortized cost	6,190
Gross write-offs
2026	0
2025	140
2024 and prior	62
Gross write-offs	202
Existing customers \| Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2026	3,783
2025	14,543
2024 and prior	8,057
Device payment plan agreement receivables, at amortized cost	26,383
Gross write-offs
2026	0
2025	52
2024 and prior	71
Gross write-offs	$ 123

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

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