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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Device payment plan agreement receivables, at amortized cost    
Device payment plan agreement receivables, at amortized cost $ 29,206 $ 26,188
Wireless service    
Gross write-offs    
Gross write-offs 470  
Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2023 17,352  
2022 10,415  
Prior to 2021 681  
Device payment plan agreement receivables, at amortized cost 28,448  
Gross write-offs    
2023 416  
2022 630  
2021 and prior 155  
Gross write-offs 1,201  
Wireless service    
Device payment plan agreement receivables, at amortized cost    
2023 5,307  
2022 45  
Device payment plan agreement receivables, at amortized cost 5,352  
Gross write-offs    
2023 317  
2022 and prior 153  
Gross write-offs 470  
New customers | Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2023 3,232  
2022 1,332  
Prior to 2021 92  
Device payment plan agreement receivables, at amortized cost 4,656  
Gross write-offs    
2023 366  
2022 403  
2021 and prior 58  
Gross write-offs 827  
Existing customers | Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2023 14,120  
2022 9,083  
Prior to 2021 589  
Device payment plan agreement receivables, at amortized cost 23,792  
Gross write-offs    
2023 50  
2022 227  
2021 and prior 97  
Gross write-offs $ 374