Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	$ 1,101	$ 1,151
2021	3
2022	271
2023	503
2024	324
Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	1,042	1,085
Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	43	43
Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	16	23
Lowest Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	1,009	1,024
2021	3
2022	259
2023	462
2024	285
Lowest Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	960	977
Lowest Risk \| Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	39	35
Lowest Risk \| Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	10	12
Lower Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	72	100
2021	0
2022	11
2023	32
2024	29
Lower Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	65	88
Lower Risk \| Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	3	5
Lower Risk \| Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	4	7
Slight Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	14	21
2021	0
2022	1
2023	6
2024	7
Slight Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	12	16
Slight Risk \| Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	1	2
Slight Risk \| Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	1	3
Higher Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	6	6
2021	0
2022	0
2023	3
2024	3
Higher Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	5	4
Higher Risk \| Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	0	1
Higher Risk \| Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	$ 1	$ 1

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