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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Device payment plan agreement receivables, at amortized cost    
Device payment plan agreement receivables, at amortized cost $ 29,137 $ 29,206
Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2024 8,193  
2023 13,433  
2022 and prior 6,668  
Device payment plan agreement receivables, at amortized cost 28,294  
Gross write-offs    
2024 60  
2023 473  
2022 and prior 170  
Gross write-offs 703  
Wireless Service Plan Receivables    
Device payment plan agreement receivables, at amortized cost    
2024 5,833  
2023 102  
Device payment plan agreement receivables, at amortized cost 5,935  
Gross write-offs    
2024 89  
2023 and prior 179  
Gross write-offs 268  
New customers | Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2024 1,635  
2023 2,289  
2022 and prior 824  
Device payment plan agreement receivables, at amortized cost 4,748  
Gross write-offs    
2024 58  
2023 375  
2022 and prior 73  
Gross write-offs 506  
Existing customers | Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2024 6,558  
2023 11,144  
2022 and prior 5,844  
Device payment plan agreement receivables, at amortized cost 23,546  
Gross write-offs    
2024 2  
2023 98  
2022 and prior 97  
Gross write-offs $ 197