Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	$ 1,054	$ 1,110
2022	86
2023	291
2024	537
2025	140
Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	993	1,050
Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	43	42
Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	18	18
Lowest Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	946	1,001
2022	82
2023	271
2024	475
2025	118
Lowest Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	898	955
Lowest Risk \| Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	38	36
Lowest Risk \| Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	10	10
Lower Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	85	86
2022	4
2023	17
2024	48
2025	16
Lower Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	76	77
Lower Risk \| Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	4	4
Lower Risk \| Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	5	5
Slight Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	16	16
2022	0
2023	2
2024	9
2025	5
Slight Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	13	13
Slight Risk \| Billed \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	1	1
Slight Risk \| Billed \| Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	2	2
Higher Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	7	7
2022	0
2023	1
2024	5
2025	1
Higher Risk \| Unbilled
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	6	5
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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