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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	$ 1,015	$ 1,007
2018	2
2019	154
2020	474
2021	385
Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	961	948
Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	40	43
Billed | Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	14	16
Lowest Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	878	863
2018	2
2019	140
2020	415
2021	321
Lowest Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	836	819
Lowest Risk | Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	35	36
Lowest Risk | Billed | Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	7	8
Lower Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	103	108
2018	0
2019	11
2020	48
2021	44
Lower Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	95	98
Lower Risk | Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	4	5
Lower Risk | Billed | Past due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	4	5
Slight Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	27	25
2018	0
2019	2
2020	8
2021	17
Slight Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	24	22
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	11
2018	0
2019	1
2020	3
2021	3
Higher Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	6	9
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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