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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	$ 1,085	$ 1,007
2019	45
2020	309
2021	731
Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	1,019	948
Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	47	43
Billed | Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	19	16
Lowest Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	946	863
2019	41
2020	278
2021	627
Lowest Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	896	819
Lowest Risk | Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	40	36
Lowest Risk | Billed | Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	10	8
Lower Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	105	108
2019	3
2020	26
2021	76
Lower Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	94	98
Lower Risk | Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	5	5
Lower Risk | Billed | Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	6	5
Slight Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	27	25
2019	1
2020	4
2021	22
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
2019	0
2020	1
2021	6
Higher Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	5	9
Higher Risk | Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	1	1
Higher Risk | Billed | Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	$ 1	$ 1

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