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Equipment Installment Plans - Gross Receivables by Credit Category (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	$ 1,069	$ 1,085
2019	16
2020	229
2021	627
2022	197
Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	1,002	1,019
Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	47	47
Billed | Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	20	19
Lowest Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	931	946
2019	15
2020	209
2021	544
2022	163
Lowest Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	881	896
Lowest Risk | Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	40	40
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	104	105
2019	1
2020	17
2021	66
2022	20
Lower Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	93	94
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	6
Slight Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	28	27
2019	0
2020	2
2021	13
2022	13
Slight Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	23	24
Slight Risk | Billed | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	2	1
Slight Risk | Billed | Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	3	2
Higher Risk
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	6	7
2019	0
2020	1
2021	4
2022	1
Higher Risk | Unbilled | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Equipment installment plan receivables, gross	5	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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