Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Device payment plan agreement receivables, at amortized cost
Device payment plan agreement receivables, at amortized cost	$ 26,521	$ 26,188
Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2023	8,660
2022	14,620
2021 and prior	2,662
Device payment plan agreement receivables, at amortized cost	25,942
Gross write-offs
2023	64
2022	385
2021 and prior	111
Gross write-offs	560
Wireless Service Plan Receivables
Device payment plan agreement receivables, at amortized cost
2023	5,078
2022	124
Device payment plan agreement receivables, at amortized cost	5,202
Gross write-offs
2023	74
2022 and prior	150
Gross write-offs	224
New customers | Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2023	1,573
2022	1,964
2021 and prior	360
Device payment plan agreement receivables, at amortized cost	3,897
Gross write-offs
2023	61
2022	269
2021 and prior	42
Gross write-offs	372
Existing customers | Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2023	7,087
2022	12,656
2021 and prior	2,302
Device payment plan agreement receivables, at amortized cost	22,045
Gross write-offs
2023	3
2022	116
2021 and prior	69
Gross write-offs	$ 188