Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of revenue that is not accounted for under Topic 606.

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Revenues and Contract Costs - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments \| segment			2
Revenue from arrangements not accounted for under Topic 606	$ 775,000,000	$ 768,000,000	$ 1,600,000,000	$ 1,500,000,000
Amortization of deferred contract costs	735,000,000	743,000,000	1,500,000,000	1,500,000,000
Contract assets impairment charge	$ 0	$ 0	$ 0	$ 0
Wireless postpaid contracts
Disaggregation of Revenue [Line Items]
Percentage of month-to-month contracts of total service contracts	94.00%	92.00%	94.00%	92.00%
Wireline Consumer and Small and Medium Business contracts
Disaggregation of Revenue [Line Items]
Percentage of month-to-month contracts of total service contracts	89.00%	80.00%	89.00%	80.00%
Minimum
Disaggregation of Revenue [Line Items]
Deferred contract cost, amortization period	2 years		2 years
Minimum \| Wireless Service, Option One
Disaggregation of Revenue [Line Items]
Customer contracts service term			1 month
Minimum \| Wireless Service, Option Two
Disaggregation of Revenue [Line Items]
Customer contracts service term			1 month
Minimum \| Consumer
Disaggregation of Revenue [Line Items]
Customer contracts service term			12 months
Minimum \| Consumer \| Reseller Arrangements
Disaggregation of Revenue [Line Items]
Customer contracts service term			2 years
Maximum
Disaggregation of Revenue [Line Items]
Deferred contract cost, amortization period	6 years		6 years
Maximum \| Wireless Service, Option One
Disaggregation of Revenue [Line Items]
Customer contracts service term			36 months
Maximum \| Wireless Service, Option Two
Disaggregation of Revenue [Line Items]
Customer contracts service term			24 months
Maximum \| Consumer
Disaggregation of Revenue [Line Items]
Customer contracts service term			2 years
Maximum \| Business
Disaggregation of Revenue [Line Items]
Customer contracts service term			12 months