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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Device payment plan agreement receivables, at amortized cost    
Device payment plan agreement receivables, at amortized cost $ 29,296 $ 29,206
Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2024 4,430  
2023 15,365  
2022 and prior 8,702  
Device payment plan agreement receivables, at amortized cost 28,497  
Gross write-offs    
2024 10  
2023 234  
2022 and prior 98  
Gross write-offs 342  
Wireless Service Plan Receivables    
Device payment plan agreement receivables, at amortized cost    
2024 5,434  
2023 244  
Device payment plan agreement receivables, at amortized cost 5,678  
Gross write-offs    
2024 13  
2023 and prior 124  
Gross write-offs 137  
New customers | Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2024 934  
2023 2,745  
2022 and prior 1,095  
Device payment plan agreement receivables, at amortized cost 4,774  
Gross write-offs    
2024 10  
2023 190  
2022 and prior 43  
Gross write-offs 243  
Existing customers | Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2024 3,496  
2023 12,620  
2022 and prior 7,607  
Device payment plan agreement receivables, at amortized cost 23,723  
Gross write-offs    
2024 0  
2023 44  
2022 and prior 55  
Gross write-offs $ 99