Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Device payment plan agreement receivables, at amortized cost
Device payment plan agreement receivables, at amortized cost	$ 26,586	$ 26,188
Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2023	4,854
2022	16,807
2021 and prior	4,387
Device payment plan agreement receivables, at amortized cost	26,048
Gross write-offs
2023	12
2022	203
2021 and prior	72
Gross write-offs	287
Wireless Service Plan Receivables
Device payment plan agreement receivables, at amortized cost
2023	4,735
2022	254
Device payment plan agreement receivables, at amortized cost	4,989
Gross write-offs
2023	9
2022 and prior	93
Gross write-offs	102
New customers | Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2023	877
2022	2,352
2021 and prior	601
Device payment plan agreement receivables, at amortized cost	3,830
Gross write-offs
2023	12
2022	144
2021 and prior	28
Gross write-offs	184
Existing customers | Device payment plan agreement
Device payment plan agreement receivables, at amortized cost
2023	3,977
2022	14,455
2021 and prior	3,786
Device payment plan agreement receivables, at amortized cost	22,218
Gross write-offs
2023	0
2022	59
2021 and prior	44
Gross write-offs	$ 103