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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue Postpaid service revenues, including postpaid phone revenues and postpaid other revenues, were as follows:
Year Ended December 31,
(in millions)202120202019
Postpaid service revenues
Postpaid phone revenues$39,154 $33,939 $21,329 
Postpaid other revenues3,408 2,367 1,344 
Total postpaid service revenues$42,562 $36,306 $22,673 
Equipment revenues from the lease of mobile communication devices were as follows:
Year Ended December 31,
(in millions)202120202019
Equipment revenues from the lease of mobile communication devices$3,348 $4,181 $599 
Schedule of Contract Liability and Receivable Balances The contract asset and contract liability balances from contracts with customers as of December 31, 2021 and 2020, were as follows:
(in millions)Contract
Assets		Contract Liabilities
Balance as of December 31, 2020$278 $824 
Balance as of December 31, 2021286 763 
Change$8 $(61)
Revenues for the years ended December 31, 2021, 2020 and 2019 include the following:
Year Ended December 31,
(in millions)202120202019
Amounts included in the beginning of year contract liability balance$767 $545 $643