v3.22.0.1
Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Revenues $ 80,118 $ 68,397 $ 44,998
Postpaid phone revenues      
Disaggregation of Revenue [Line Items]      
Revenues 39,154 33,939 21,329
Postpaid other revenues      
Disaggregation of Revenue [Line Items]      
Revenues 3,408 2,367 1,344
Postpaid service revenues      
Disaggregation of Revenue [Line Items]      
Revenues 42,562 36,306 22,673
Equipment revenues from the lease of mobile communication devices      
Disaggregation of Revenue [Line Items]      
Revenues 3,348 4,181 $ 599
Wireless service revenues | Sprint      
Disaggregation of Revenue [Line Items]      
Revenues $ 739 $ 626