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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Credit Quality Indicators (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Device payment plan agreement receivables, at amortized cost    
Device payment plan agreement receivables, at amortized cost $ 29,202 $ 29,206
Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2024 11,868  
2023 11,522  
2022 and prior 4,929  
Device payment plan agreement receivables, at amortized cost 28,319  
Gross write-offs    
2024 223  
2023 642  
2022 and prior 225  
Gross write-offs 1,090  
Wireless Service Plan Receivables    
Device payment plan agreement receivables, at amortized cost    
2024 5,995  
2023 62  
Device payment plan agreement receivables, at amortized cost 6,057  
Gross write-offs    
2024 226  
2023 and prior 182  
Gross write-offs 408  
New customers | Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2024 2,253  
2023 1,901  
2022 and prior 601  
Device payment plan agreement receivables, at amortized cost 4,755  
Gross write-offs    
2024 205  
2023 490  
2022 and prior 95  
Gross write-offs 790  
Existing customers | Device payment plan agreement    
Device payment plan agreement receivables, at amortized cost    
2024 9,615  
2023 9,621  
2022 and prior 4,328  
Device payment plan agreement receivables, at amortized cost 23,564  
Gross write-offs    
2024 18  
2023 152  
2022 and prior 130  
Gross write-offs $ 300