Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	$ 1,075	$ 1,151
2021	1
2022	198
2023	427
2024	449
Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	1,020	1,085
Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	38	43
Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	17	23
Lowest Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	978	1,024
2021	1
2022	189
2023	395
2024	393
Lowest Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	934	977
Lowest Risk \| Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	34	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	75	100
2021	0
2022	8
2023	26
2024	41
Lower Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	68	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	16	21
2021	0
2022	1
2023	4
2024	11
Slight Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	13	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	2	3
Higher Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	6	6
2021	0
2022	0
2023	2
2024	4
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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