v3.25.3
Sales of Certain Receivables - Schedule of Factoring Arrangement (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Other current liabilities $ 2,581 $ 1,965
Other long-term liabilities 3,783 4,000
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Derecognized net service accounts receivable and EIP receivables 1,663 1,616
Other current liabilities 385 409
Other long-term liabilities 14 32
Net cash proceeds since inception 1,394 1,468
Of which:    
Change in net cash proceeds during the year-to-date period (74) (115)
Net cash proceeds funded by reinvested collections 1,468 1,583
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other current liabilities - of which, recourse guarantee    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying amounts of deferred purchase price assets 123 116
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary | Other long-term liabilities - of which, recourse guarantee    
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]    
Carrying amounts of deferred purchase price assets $ 14 $ 32